SAFETY KLEEN CORP/
DEF 14A, 1999-07-30
HAZARDOUS WASTE MANAGEMENT
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                            SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934
                              (Amendment No. ____)

Filed by the Registrant [x]
Filed by a Party other than the Registrant [ ]

Check the appropriate box:

[  ]  Preliminary Proxy Statement
[  ]  Confidential,  for  Use of the  Commission  Only  (as  permitted  by  Rule
      14a-6(e)(2))
[X ]  Definitive  Proxy  Statement
[  ]  Definitive Additional Materials
[  ]  Soliciting Material Pursuant to 240.14a-11(c) or 240.14a-12

      SAFETY-KLEEN CORP.

- --------------------------------------------------------------------------------
      (Name of Registrant as Specified In Its Charter)

      N/A

- --------------------------------------------------------------------------------
      (Name of Person(s) Filing Proxy Statement if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

[X]   No fee required
[ ]   Fee computed on table below per Exchange Act Rules 14(a)-6(i)(4) and 0-11.

      1) Title of each class of securities to which transaction applies:

      2) Aggregate number of securities to which transaction applies:

         -----------------------------------------------------------------------

      3) Per unit  price  or other  underlying  value  of  transaction  computed
         pursuant to  Exchange  Act Rule 0-11 (Set forth the amount on which the
         filing fee is calculated and state how it was determined):

         -----------------------------------------------------------------------

      4) Proposed maximum aggregate value of transaction:

         -----------------------------------------------------------------------

      5) Total fee paid:

         -----------------------------------------------------------------------

[ ]   Fee paid previously with preliminary materials.

[ ]   Check box if any  part  of the fee is offset as  provided  by Exchange Act
      Rule  0-11(a)(2)  and identify the filing for which the offsetting fee was
      paid  previously.  Identify the previous filing by registration  statement
      number, or the Form or Schedule and the date of its filing.

      1) Amount Previously Paid:

         -----------------------------------------------------------------------

      2) Form, Schedule or Registration Statement No.:

         -----------------------------------------------------------------------

      3) Filing Party:

         -----------------------------------------------------------------------

      4) Date Filed:

         -----------------------------------------------------------------------


<PAGE>



                               DATED JULY 30, 1999

                            [SAFETY-KLEEN CORP. LOGO]

                                                                 July 30, 1999

Dear Stockholder:

         You  are  cordially   invited  to  attend  a  Special  Meeting  of  the
stockholders of Safety-Kleen  Corp.  (the  "Company"),  to be held on August 27,
1999, at 9:00 a.m.  local time,  at 1301 Gervais  Street,  Suite 300,  Columbia,
South Carolina 29201.

         At the  Special  Meeting  you will be asked to approve a proposal  (the
"Proposal") relating to the issuance of shares (the "Shares") of common stock of
the  Company,  par value  $1.00 per  share  (the  "Common  Stock"),  to  Laidlaw
International Finance Corporation ("LIFC") or another affiliate of Laidlaw Inc.,
in connection with the Company's  proposed  repurchase (the "Repurchase") of its
outstanding $350 million 5% Subordinated  Convertible  Pay-In-Kind Debenture due
2009 (the "PIK Debenture") held by LIFC. The Shares include 11,320,755 shares of
Common Stock plus an  additional  number of shares of Common Stock in payment of
accrued and unpaid  interest  on the  outstanding  principal  balance of the PIK
Debenture to the date of the Repurchase.

         The Board of Directors has determined that the approval of the Proposal
is advisable and in the best interests of the Company and its Stockholders,  has
approved the Proposal and  recommends  to the  Stockholders  that you vote "FOR"
approval of the Proposal.

         Additional  information  regarding  the  Proposal is  contained  in the
accompanying  Proxy  Statement.  In view of the  importance of the actions to be
taken  at the  Special  Meeting,  we urge  you to read  the  accompanying  Proxy
Statement carefully,  and regardless of the number of shares you own, we request
that you complete, sign, date and return the enclosed proxy card promptly in the
accompanying  prepaid envelope.  You may, of course,  attend the Special Meeting
and vote in person, even if you have previously returned your proxy card.

         We urge you to vote "FOR" approval of the Proposal.

                                          Sincerely,


                                          /s/ Kenneth W. Winger

                                          Kenneth W. Winger
                                          President and Chief Executive Officer


<PAGE>


                               SAFETY-KLEEN CORP.
                         1301 Gervais Street, Suite 300
                         Columbia, South Carolina 29201

                            ------------------------

                    NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                          To Be Held On August 27, 1999

                            ------------------------

                    TO THE STOCKHOLDERS OF SAFETY-KLEEN CORP.

         Notice is hereby given that a special  meeting (the "Special  Meeting")
of the stockholders of Safety-Kleen Corp. (the "Company") will be held on August
27, 1999, at 9:00 a.m. local time, at 1301 Gervais Street,  Suite 300, Columbia,
South Carolina 29201, for the following purposes:

         1. To approve the issuance of shares (the  "Shares") of common stock of
the  Company,  par value  $1.00 per  share  (the  "Common  Stock"),  to  Laidlaw
International Finance Corporation ("LIFC") or another affiliate of Laidlaw Inc.,
in connection with the Company's  proposed  repurchase (the "Repurchase") of its
outstanding $350 million 5% Subordinated  Convertible  Pay-In-Kind Debenture due
2009 (the "PIK Debenture") held by LIFC. The Shares include 11,320,755 shares of
Common Stock plus an  additional  number of shares of Common Stock in payment of
accrued and unpaid  interest  on the  outstanding  principal  balance of the PIK
Debenture to the date of the Repurchase.

         2. To  transact  such other  business as may  properly  come before the
Special Meeting or any adjournment or postponement thereof.

         The Board of Directors has fixed the close of business on July 19, 1999
as the record date for the  determination  of  stockholders  entitled to receive
notice  of and to  vote  at  the  Special  Meeting  and  at any  adjournment  or
postponement thereof.

         From August 16, 1999 until the date of the Special  Meeting,  a list of
stockholders  entitled  to vote at the Special  Meeting  will be  available  for
inspection by  stockholders  of record during business hours at the place of the
Special Meeting and also will be available at the Special Meeting.

         Your attention is directed to the Proxy  Statement  submitted with this
Notice.

         Please  complete,  date and sign the enclosed  proxy card and return it
promptly in the enclosed  envelope whether or not you plan to attend the Special
Meeting. If you attend the Special Meeting,  you may vote in person if you wish,
even if you have previously returned your proxy card.

                         -------------------------------

By Order of the Board of Directors                   /s/ Henry H. Taylor
Columbia, South Carolina                             Henry H. Taylor, Secretary

- ----------


<PAGE>




                               SAFETY-KLEEN CORP.
                         1301 Gervais Street, Suite 300
                         Columbia, South Carolina 29201

                                 PROXY STATEMENT
                         ------------------------------

                         Special Meeting of Stockholders

                                 August 27, 1999

         This Proxy Statement is being mailed to holders (the "Stockholders") of
common stock,  par value $1.00 per share (the "Common  Stock"),  of Safety-Kleen
Corp.  (the "Company") as of the close of business on July 19, 1999 (the "Record
Date") in connection with the  solicitation of proxies by the Board of Directors
of the Company (the "Board") for use at a special meeting of the Stockholders to
be held at 1301 Gervais  Street,  Suite 300,  Columbia,  South Carolina 29201 on
August 27, 1999, at 9:00 a.m. local time, and at any adjournment or postponement
thereof (the "Special Meeting").

         At the  Special  Meeting  you will be asked to approve a proposal  (the
"Proposal") relating to the issuance of shares (the "Shares") of common stock of
the  Company,  par value  $1.00 per  share  (the  "Common  Stock"),  to  Laidlaw
International Finance Corporation ("LIFC") or another affiliate of Laidlaw Inc.,
in connection with the Company's  proposed  repurchase (the "Repurchase") of its
outstanding $350 million 5% Subordinated  Convertible  Pay-In-Kind Debenture due
2009 (the "PIK Debenture") held by LIFC. The Shares include 11,320,755 shares of
Common Stock plus an  additional  number of shares of Common Stock in payment of
accrued and unpaid  interest  on the  outstanding  principal  balance of the PIK
Debenture to the date of the Repurchase.

         This  Proxy  Statement  and form of Proxy  are  first  being  mailed or
otherwise delivered to Stockholders on or about July 30, 1999.

         The Board has determined that the approval of the Proposal is advisable
and in the best interests of the Company and the Stockholders,  has approved the
Proposal and recommends to the Stockholders  that you vote "FOR" approval of the
Proposal.

         You are cordially invited to attend the Special Meeting.  If you cannot
be present in person,  please sign and date the enclosed proxy and promptly mail
it in the enclosed return postage paid envelope.  Any stockholder giving a proxy
has the right to revoke it any time before such proxy is voted.

         Your vote is  important.  You are  urged to date and sign the  enclosed
proxy and return it in the enclosed  postage paid  envelope as soon as possible.
You may  revoke  the  proxy at any time  prior to its use by  delivering  to the
Company a written  notice of revocation or a duly executed proxy bearing a later
date.  Any  stockholder  who has  executed a proxy but is present at the Special
Meeting and who wishes to vote in person may do so by revoking  his,  her or its
proxy as described in the preceding sentence.

                         -------------------------------

                THE DATE OF THIS PROXY STATEMENT IS JULY 30, 1999


<PAGE>

                                   THE COMPANY

         The Company  provides  industrial  waste services  designed to collect,
process,  recycle and dispose of hazardous and  industrial  waste  streams.  The
Company  provides  these  services  from  numerous   collection   locations  and
processing  facilities  located in the United States and Canada. The Company was
incorporated in Delaware in 1968.

         The  Company's  principal  executive  office is located at 1301 Gervais
Street,  Suite 300,  Columbia,  South Carolina 29201 and its telephone number is
803-933-4200.

         The Common  Stock is listed  and traded on the New York Stock  Exchange
and on the Pacific  Exchange,  Inc.  On July 23,  1999 the closing  price of the
Common Stock on the New York Stock Exchange was $12.00.

                                     PROXIES

        The  accompanying  form of proxy is for use at the  Special  Meeting.  A
Stockholder  may use this proxy if he or she is unable to attend the  meeting in
person or if he or she wishes to have his or her  shares  voted by proxy even if
he or she attends the meeting. The proxy may be revoked in writing by the person
giving  it any time  before  the  proxy is  exercised  by  giving  notice to the
Company's  Secretary,  or by  submitting a proxy having a later date, or by such
person  appearing  at the  meeting and  electing  to vote in person.  All shares
represented  by valid  proxies  received in this  solicitation,  and not revoked
prior to their exercise,  will be voted in the manner specified in such proxies.
If no  specification  is made in the proxy,  the proxy  will be voted  "FOR" the
Proposal. The Board is not aware of any other matters which may be presented for
action at the Special Meeting,  but if other matters do come properly before the
Special Meeting shares  represented by proxies in the accompanying  form will be
voted by the persons named in the proxy in accordance with their best judgment.

         The Company  will bear the costs of  solicitation  of proxies  from the
Stockholders.  Solicitation  of  proxies  may be made in  person,  by mail or by
telephone, by officers,  directors and regular employees of the Company who will
not be specially  compensated in such regard.  Nominees,  fiduciaries  and other
custodians will be requested to forward solicitation materials to the beneficial
owners and secure  their  voting  instructions  and will be  reimbursed  for the
reasonable  expenses  incurred  in sending  proxy  materials  to the  beneficial
owners.  In  addition,  the  Company has  engaged  the  services of  ChaseMellon
Shareholder Services to solicit proxies and will pay such proxy soliciting agent
$4500.00 plus expenses in connection therewith. Solicitation by such firm may be
by mail, personal interview, telephone, fax or telegraph. Arrangements also will
be made with brokerage firms and other  custodians,  nominees and fiduciaries to
forward proxy  solicitation  material to the  beneficial  owners of Common Stock
held of record by such persons,  and the Company will  reimburse  such brokerage
firms,  custodians,   nominees  and  fiduciaries  for  reasonable  out-of-pocket
expenses incurred by them in connection therewith.

                                     VOTING

         The Board has fixed the close of  business  on the Record  Date for the
determination  of Stockholders  entitled to receive notice of and to vote at the
Special Meeting.  As of the Record


                                      -2-
<PAGE>


Date,  there were a total of 88,939,049  shares of the Common Stock  outstanding
and entitled to vote at the Special Meeting. Each Stockholder is entitled to one
vote for each share of Common  Stock held of record by such  Stockholder  on the
Record Date on each matter to come before the  Special  Meeting.  The  Company's
Certificate of Incorporation and By-laws do not provide for cumulative voting.

VOTE REQUIRED

         Under Rule 312 of the New York Stock Exchange, approval of the Proposal
requires  the  affirmative  vote of a  majority  of the votes cast in respect of
outstanding  shares of Common  Stock at the  Special  Meeting;  provided  that a
majority of the votes  entitled to be cast by all  outstanding  shares of Common
Stock are cast at the Special  Meeting.  Under  Delaware  law and the  Company's
Certificate of Incorporation and By-Laws, the affirmative vote of the holders of
a majority of the shares of Common Stock  represented  in person or by proxy and
entitled to vote at the Special  Meeting is  necessary  to approve or ratify any
act of the Company or to transact any other business which may be brought before
the Special Meeting.

         Abstentions  and broker  non-votes with respect to any proposal  coming
before the Special Meeting,  including the Proposal,  will be counted as present
for purposes of  determining  the existence of a quorum,  but will not be deemed
votes cast for  purposes of  determining  the total  number of shares of which a
majority  is  required  for any  purpose.  As a result,  abstentions  and broker
non-votes will have the same legal effect on the outcome as a vote "against" the
Proposal,  even though a Stockholder or other interested  parties  analyzing the
results of the voting may interpret such a vote differently.

PRINCIPAL STOCKHOLDER

         Laidlaw,   which   beneficially  owns   approximately   36.15%  of  the
outstanding  Common Stock as of July 20, 1999,  has informed the Company that it
intends  to vote for  approval  of the  Proposal  at the  Special  Meeting.  See
"Principal  Stockholders and Management  Ownership," "Certain  Relationships and
Related Transactions" and "The Proposal."

DISSENTERS' OR APPRAISAL RIGHTS

         The Stockholders of the Company have no dissenters' or appraisal rights
in connection with the Proposal.

                 PRINCIPAL STOCKHOLDERS AND MANAGEMENT OWNERSHIP

PRINCIPAL STOCKHOLDER

      The  following  table  sets  forth  the only  Stockholders  which,  to the
knowledge of management of the Company,  were beneficial  owners of five percent
(5%) or more of the outstanding  shares of Common Stock as of July 20, 1999. The
shareholdings of Laidlaw are based on information  provided by such Stockholder.
The  shareholdings of Mellon Bank Corporation are based solely on a Schedule 13G
Report  filed  with the  Securities  and  Exchange  Commission  by  Mellon  Bank
Corporation in January 1999.


                                      -3-
<PAGE>


                                AMOUNT AND NATURE OF        PERCENT OF CLASS
     NAME                             OWNERSHIP            BENEFICIALLY OWNED

Laidlaw Inc. (1)                     32,148,674                   36.15%
3221 North Service Road
Burlington, Ontario
L7R 3Y8
CANADA

Mellon Bank Corporation               5,504,040                    6.19%
One Mellon Bank Center
Pittsburgh, Pennsylvania 15258

- -----------------------------------

(1) Shares of Common Stock shown as owned by Laidlaw,  except for 31 shares, are
held of record by Laidlaw Finance (Barbados) Ltd.

MANAGEMENT OWNERSHIP

         The  following  table  sets  forth as of July 20,  1999,  the number of
shares  of  Common  Stock  beneficially  owned  by (i)  each  of  the  Company's
directors,  (ii) the Chief Executive  Officer of the Company,  (iii) each of the
Company's other executive officers and (iv) all directors and executive officers
of the Company as a group.

                                      AMOUNT AND NATURE OF    PERCENT OF CLASS
         NAME                               OWNERSHIP        BENEFICIALLY OWNED

James R. Bullock (1), (2), (3)..............  9,020                 *
Leslie W. Haworth (1), (2), (4).............  3,937                 *
John W. Rollins, Jr. (1), (5), (6).......... 90,704                 *
John W. Rollins, Sr. (1), (6), (7)..........958,289                 1%
David E. Thomas, Jr. (1), (6)...............  2,645                 *
Henry B. Tippie (1), (6), (8)...............576,962                 *
James L. Wareham (1), (6)...................  2,895                 *
Grover C. Wrenn (1), (6)....................  6,395                 *
Kenneth W. Winger (9), (10)................. 42,211                 *
Michael J. Bragagnolo (9)................... 22,500                 *
Paul R. Humphreys (9).......................  9,000                 *
Henry H. Taylor (9), (10)...................  3,557                 *
Robert W. Luba (11).........................  5,000                 *


All directors and
executive officers as a group

(13 persons)..............................1,733,115                1.95%

- ------------------------

*        Signifies less than 1%

                                      -4-
<PAGE>

(1) Includes 2,000 shares  subject to presently  exercisable  options.  Does not
include 13,000 shares which are subject to vesting requirements  pursuant to the
Directors Stock Option Plan. Under such Plan,  options become exercisable at the
rate of 20% per  year,  on or about one year  after the date of grant,  with all
options becoming fully vested on or about five years after the date of grant.

(2)  Messrs.  Bullock  and Haworth  are  officers  of  Laidlaw.  See  "Principal
Stockholders" for information  regarding the beneficial  ownership of the Common
Stock by Laidlaw.

(3)  Includes  770  shares of  restricted  stock  granted  on January 5, 1999 in
accordance  with the  Nonemployee  Director  Stock Plan. The shares do not fully
vest until January 5, 2000. Includes 6,250 shares owned by Mr. Bullock's spouse.
Does not include 12,500 shares indirectly owned by Midcorp (J.P.C.) Limited,  as
to which shares Mr. Bullock disclaims any beneficial ownership.

(4)  Includes  687  shares of  restricted  stock  granted  on January 5, 1999 in
accordance  with the  Nonemployee  Director  Stock Plan. The shares do not fully
vest until January 5, 2000.

(5) Includes  46,528 shares held by Mr. Rollins as co-trustee.  Does not include
1,547  shares  owned by Mr.  Rollins'  wife,  as to  which  shares  Mr.  Rollins
disclaims any beneficial ownership.

(6)  Includes  645  shares of  restricted  stock  granted  on January 5, 1999 in
accordance  with the  Nonemployee  Director  Stock Plan. The shares do not fully
vest until January 5, 2000.

(7) Does not include 58,937 shares owned by Mr.  Rollins' wife and 30,717 shares
held by his wife as  custodian  for his minor  children,  as to which shares Mr.
Rollins disclaims any beneficial ownership.

(8) Includes 242,172 shares held by Mr. Tippie as co-trustee;  6,500 shares held
by him as trustee;  and 7,500  shares in which a wholly owned  corporation  over
which he has sole  voting  power has a  beneficial  partnership  interest  of 75
shares and voting right for 7,500 shares. Does not include 5,750 shares owned by
Mr.  Tippie's  wife,  as to which shares Mr.  Tippie  disclaims  any  beneficial
ownership.

(9) Includes shares subject to presently  exercisable options.  Does not include
remaining shares which are subject to vesting requirements  pursuant to the 1997
Stock Option Plan. Options become exercisable at the rate of 20% per year, on or
about one year after the date of grant,  with all options  becoming fully vested
on or about five years after the date of grant.

(10) Includes holdings of Common Stock held through the Company's 401(k) plan.

(11) Does not  include  7500 shares  which are  subject to vesting  requirements
pursuant to the Directors  Stock Option Plan.  Under such Plan,  options  become
exercisable  at the rate of 20% per year, on or about one year after the date of
grant,  with all options  becoming fully vested on or about five years after the
date of grant.  Mr.  Luba  became a  director  on March  30,1999  following  the
resignation of Mr. John Grainger.



                                      -5-
<PAGE>




                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

LAIDLAW EXECUTIVE OFFICERS AND STOCK OWNERSHIP

         James R. Bullock and Leslie W. Haworth,  directors of the Company,  are
executive  officers of  Laidlaw.  See  "Principal  Stockholders  and  Management
Ownership  --  Management  Ownership."  Mr.  John  Grainger,  also an officer of
Laidlaw,  resigned  from the  Board  on March  30,  1999,  prior to the  Board's
consideration of the Repurchase and the Proposal.

         As of July 20, 1999, Laidlaw beneficially owned, directly or indirectly
through affiliates,  32,148,674 shares of Common Stock, or approximately  36.15%
of the  outstanding  Common  Stock.  Assuming  conversion  by Laidlaw of the PIK
Debenture  in  accordance  with  its  terms,  Laidlaw  would  own,  directly  or
indirectly  through  affiliates,  approximately  54.9  million  shares of Common
Stock, or  approximately  49.2% of the then outstanding  Common Stock,  assuming
that Laidlaw  retains all of the Common Stock owned by it. Upon  issuance of the
Shares in connection with the Repurchase,  Laidlaw is expected to own,  directly
or  indirectly  through its  affiliates,  approximately  43.9 million  shares of
Common Stock,  or  approximately  43.59% of the then  outstanding  Common Stock,
assuming  that  Laidlaw  retains  all of  the  Common  Stock  owned  by it.  See
"Principal Stockholders and Management Ownership -- Principal Stockholder." (The
total  number of shares of Common  Stock owned by Laidlaw  upon  issuance of the
Shares is based upon the assumption that the Shares include  415,525  additional
shares of Common Stock  issued in payment of accrued and unpaid  interest on the
PIK Debenture through the date of the Repurchase in accordance with the terms of
the PIK Debenture as described  under the caption "Terms of the PIK  Debenture."
This  assumption  is based upon an assumed  August 27, 1999 closing date for the
Repurchase and upon an average price per share of Common Stock of $12.00.

THE ACQUISITION

         In May 1997, the Company  acquired the hazardous and  industrial  waste
operations of Laidlaw (the "Acquisition").  The Acquisition was accounted for as
a reverse  acquisition  by the Company using the purchase  method of accounting.
The Acquisition involved:

         (i) the  issuance by the Company of 30 million  shares of Common  Stock
         and the PIK Debenture to Laidlaw; and

         (ii) the  payment  by the  Company  of  $349.1  million  in cash  ($400
         million, less debt of $50.9 million assumed) to Laidlaw.

         Laidlaw acquired  approximately  67% of the Common Stock as a result of
the Acquisition. Laidlaw's holdings were subsequently diluted by the issuance of
shares  of  Common  Stock  in  connection  with  the  Company's  acquisition  of
Safety-Kleen in April 1998.

         LAIDLAW INDEMNITIES

         In connection with the Acquisition, Laidlaw and Laidlaw Transportation,
Inc. ("LTI"), a subsidiary of Laidlaw,  agreed,  subject to various limitations,
jointly  and  severally  to  indemnify  and hold  harmless  the  Company and its
affiliates from and against damages suffered


                                      -6-
<PAGE>


by the  Company resulting  from or in respect of (i) various tax obligations and
liabilities,  (ii) pre-closing  insurance claims, (iii) any breach or default in
the  performance  by Laidlaw or LTI of covenants and  agreements in the purchase
agreement  for the  Acquisition  to be  performed on or after the closing of the
Acquisition  or of any  representation  or warranty in such  purchase  agreement
which  survives  the  closing  to  the  extent  that  damages  therefrom  exceed
$2,000,000,  and (iv) any environmental liability or environmental claim arising
as a result of any act or omission  by Laidlaw or LTI,  including  any  release,
occurring prior to such closing.

         LAIDLAW GUARANTIES

         In connection with the  Acquisition,  Laidlaw entered into on behalf of
the Company  various  guaranties,  performance  guaranties,  bonds,  performance
bonds,  suretyship  arrangements,  surety  bonds,  credits,  letters  of credit,
reimbursement   agreements  and  other  undertakings,   deposit  commitments  or
arrangements  by which Laidlaw may be primarily,  secondarily,  contingently  or
conditionally  liable for  present or future  obligations  of the  Company.  The
Company  agreed to use its best efforts to cause Laidlaw to be fully and finally
released and discharged  from all further  liability or obligation in respect of
all such obligations  within six months following the date of the closing of the
Acquisition. As of the date hereof Laidlaw had been discharged from most of such
obligations.

SERVICE ARRANGEMENTS

         Laidlaw and its  affiliates  have  provided  financial  and  management
services  to the  Company  and its  subsidiaries,  including  providing  general
liability and workers'  compensation  insurance and income tax management.  Such
service  arrangements  have  been  on  arms-length  terms  comparable  to  those
available in  transactions  with  unaffiliated  parties.  During the fiscal year
ended August 31, 1998, the Company paid Laidlaw $11.3 million on account of such
services.

OTHER RELATIONSHIPS

         In the ordinary  course of business,  the Company or its affiliates and
Laidlaw or  affiliates  of Laidlaw  have  entered from time to time into various
business  transactions and agreements wherein Laidlaw provided certain financial
and management  services to the Company or its  affiliates.  These services have
included providing general liability and workers' compensation insurance, income
tax management and treasury services.

RAYMOND JAMES & ASSOCIATES, INC.

         Raymond James & Associates,  Inc. acted as an initial  purchaser in the
offering of the  Company's  senior notes  described in "The Proposal -- Purposes
and Effects of the  Proposal -- The  Repurchase  and Related  Financing."  Since
September  1, 1997,  Raymond  James &  Associates,  Inc.  has acted as financial
advisor  to the  Company  for  various  transactions,  including  the  Company's
acquisition of Safety-Kleen, and is expected to continue to act in such capacity
in the  future.  David E.  Thomas,  Jr., a director,  is a Managing  Director of
Raymond James & Associates, Inc.


                                      -7-
<PAGE>


                                  THE PROPOSAL

PURPOSES AND EFFECTS OF THE PROPOSAL

         NEW YORK STOCK EXCHANGE RULE 312

         The  purpose  of the  Proposal  is to permit  the  Company to issue the
Shares  to  LIFC or  another  affiliate  of  Laidlaw,  in  connection  with  the
Repurchase.  Stockholders  are not being  asked to approve the  Repurchase.  See
"Principal Stockholders and Management Ownership" and "Certain Relationships and
Related Transactions."

         Delaware law does not require stockholder  approval of any kind for the
issuance of the Shares or for the  Repurchase.  The Company is seeking  specific
approval of the Proposal to insure full compliance with the terms, to the extent
applicable,  of Rule  312 of the New York  Stock  Exchange.  Rule  312  requires
stockholder  authorization  in connection  with the issuance of shares of common
stock to  officers,  directors,  holders  of 5% or more of the  issuer's  voting
power,  and their  affiliates or other closely  related  persons,  if the common
stock so issued would  represent  more than 1% of the common  stock  outstanding
prior to such  issuance.  The Shares will  represent more than 12% of the Common
Stock outstanding prior to issuance of the Shares.

         If the Stockholders approve the Proposal, the Company currently intends
to seek  listing  approval of the Shares on the New York Stock  Exchange and the
Pacific Exchange,  Inc., repurchase the PIK Debenture for cash and the Shares as
set forth below and issue the Shares to LIFC or another affiliate of Laidlaw.

         THE REPURCHASE AND RELATED FINANCING

         The PIK  Debenture  is held by LIFC,  which is an affiliate of Laidlaw.
The Company  currently  intends to effect the  Repurchase  for a purchase  price
consisting  of (i) $200  million  in cash and (ii)  the  Shares  (consisting  of
11,320,755  shares of Common Stock plus an additional number of shares of Common
Stock in payment of accrued  and unpaid  interest on the  outstanding  principal
balance  of the PIK  Debenture  to the  date of the  Repurchase,  calculated  in
accordance with the terms of the PIK Debenture).  The Company,  Laidlaw and LIFC
have entered into a securities  purchase agreement to effect the Repurchase (the
"Securities  Purchase  Agreement").  The Securities  Purchase Agreement contains
certain  customary  representations,  warranties  and covenants  relating to the
Repurchase.  Under the  Securities  Purchase  Agreement  the Board is  required,
subject to its  fiduciary  duties,  to call the Special  Meeting  and  recommend
approval of the Proposal.  The Company's obligation to consummate the Repurchase
is conditioned upon, among other things,  stockholder  approval of the Proposal.
Other  conditions to the  Company's  obligation  to  consummate  the  Repurchase
included (i) the satisfactory  completion of a financing for the cash portion of
the purchase price in the Repurchase,  which was completed in May 1999, and (ii)
the receipt of required  bank  consents,  which were  obtained in May 1999.  The
Securities Purchase Agreement may be terminated by mutual consent of the parties
or by any party if the  closing of the  Repurchase  does not occur by August 31,
1999.



                                      -8-
<PAGE>


         The Company  intends to finance the cash portion of the purchase  price
with a portion  of the net cash  proceeds  of its  offering  of $225  million in
aggregate  principal  amount of its 9 1/4%  Senior  Notes due 2009 (the  "Senior
Notes"),  completed in May 1999. To the extent not used in the  Repurchase,  any
net proceeds from the Senior Notes are expected to be used for general corporate
purposes.  The Senior  Notes have a ten year term,  are  senior,  unsubordinated
securities of the Company and have covenants  substantially  similar to those in
the  outstanding  senior   subordinated  notes  of  the  Company's   subsidiary,
Safety-Kleen  Services,  Inc. Interest on the Senior Notes is payable in cash at
the rate of 9 1/4% per annum.

         The net proceeds of the Senior  Notes are being held in escrow  pending
completion of the Repurchase. The Company is required to redeem the Senior Notes
for 101% of the principal  amount plus accrued and unpaid  interest,  if any, to
the date of redemption if the Stockholders do not approve the Repurchase and the
other closing conditions in the Securities  Purchase Agreement are not satisfied
or waived (collectively,  the "Funding Conditions") by September 30, 1999. Funds
so held in escrow  pending  completion  of the  Repurchase  are invested in cash
equivalents and U.S. government obligations.

PURPOSES AND EFFECTS OF THE REPURCHASE

         If the  Proposal is approved,  Repurchase  will be effected and the PIK
Debenture  will, upon closing of the  Repurchase,  cease to be outstanding.  The
Company has negotiated the Repurchase with Laidlaw for the following reasons:

         (i) To reduce the Company's  consolidated  indebtedness and to increase
         consolidated  stockholders'  equity.  The  Company  has raised the cash
         portion of the purchase price of the PIK Debenture through its offering
         of Senior  Notes and will  finance  the balance of the  purchase  price
         through the issuance of the Shares.  As a result,  the Repurchase  will
         reduce  the  Company's  consolidated  net  debt by  approximately  $150
         million  and  increase  consolidated  stockholders'  equity by the same
         amount.  If the Repurchase  had occurred on May 31, 1999,  consolidated
         total  indebtedness  (long  term  debt  and the PIK  Debenture)  of the
         Company would have been reduced from  $2,336,668,000  to $2,211,668,000
         and  consolidated  stockholders'  equity would have been increased from
         $1,111,338,000 to $1,261,338,000.

         (ii) To simplify its capital structure  through  elimination of the PIK
         Debenture.  The PIK  Debenture  has added  complexity  to the Company's
         capital  structure and, the Company  believes,  caused confusion in the
         investment community.  Replacement of the PIK Debenture with the Senior
         Notes  and  Common   Stock  will   provide  the  Company  with  a  more
         conventional   capital   structure  which  will  assist   investors  in
         evaluating the Company's financial performance.

         (iii) To eliminate  the potential  for dilution  resulting  from future
         issuances  and  sales of Common  Stock  upon  payment  of  interest  or
         conversion  of the PIK  Debenture.  While the effect,  if any, that any
         such future  issuances  and sales of shares would have on market prices
         for the  Common  Stock is  uncertain,  the  Company  believes  that the
         perception  that such  issuances  and sales could  occur has  adversely
         affected the prevailing market price for the Common Stock.


                                      -9-
<PAGE>


         (iv) To eliminate the current  dilutive  impact of the PIK Debenture on
         basic  earnings per share.  For example,  for the nine months ended May
         31, 1999, the Company's  diluted  earnings per share were 12% below its
         basic earnings per share.  After the  Repurchase,  the Company  expects
         basic and diluted earnings per share to be comparable.

         The  Repurchase  will  also  reduce   Laidlaw's  fully  diluted  equity
ownership of the Company. Assuming conversion by Laidlaw of the PIK Debenture in
accordance  with its terms,  Laidlaw would own,  directly or indirectly  through
affiliates,  approximately 54.9 million shares of Common Stock, or approximately
49.2% of the then outstanding Common Stock.  Following closing of the Repurchase
and the issuance of the Shares as described above, Laidlaw will own, directly or
indirectly  through  affiliates,  approximately  43.9  million  shares of Common
Stock,  or  approximately  43.59%  of the then  outstanding  Common  Stock.  See
"Principal Stockholders and Management Ownership -- Principal Stockholder." (The
total  number of shares of Common  Stock owned by Laidlaw  upon  issuance of the
Shares is based upon the assumption that the Shares include  415,525  additional
shares of Common Stock  issued in payment of accrued and unpaid  interest on the
PIK Debenture through the date of the Repurchase in accordance with the terms of
the PIK Debenture as described  under the caption "Terms of the PIK  Debenture."
This  assumption  is based upon an assumed  August 27, 1999 closing date for the
Repurchase and upon an average price per share of Common Stock of $12.00.

         Finally,  the Company  believes the Repurchase could have the following
additional effects on its financial position:

         (i)  Increasing  the  consolidated  indebtedness,  as  defined  by  the
         Company's debt instruments.  The Repurchase will have the effect on the
         Company's  financial position of increasing the Company's  consolidated
         indebtedness  because the PIK Debenture is excluded from the definition
         of indebtedness  under the Company's bank credit  agreement,  while the
         Senior Notes are included in such definition.  As a consequence of this
         increase and the  existing  covenants  in those debt  instruments,  the
         Company's  operational and strategic  flexibility  may be reduced.  For
         example,  the Company may experience  reduced  availability  of debt to
         finance possible future transactions.

         (ii)  Increasing  interest  expense  required  to be paid in cash.  The
         Company is required to settle the semi-annual  interest payments on the
         PIK  Debenture by the issuance of Common Stock  through  April 8, 2000.
         After April 8, 2000, the Company could settle interest  payments on the
         PIK Debenture in either cash or Common Stock at is sole discretion. The
         Senior Notes require cash  interest  payments at the rate of 9 1/4% per
         annum.

         (iii)  Diluting  earnings per share on a basic  basis.  The issuance of
         additional  shares will reduce the Company's  basic earnings per share.
         However, the Company expects such reduction to be less significant than
         the dilutive impact of the PIK Debenture. The Company believes that the
         investment  community  historically  evaluated the Company based on its
         diluted earnings per share, among other criteria.


                                      -10-
<PAGE>



         (iv) The  incurrence  of a $15  million  extraordinary  loss due to the
         write-off  of a deferred  tax asset which will no longer be  realizable
         due to the Repurchase.

         The terms of the  Repurchase  were  negotiated  between the Company and
Laidlaw during March and April 1999. The relative values ascribed by the Company
to the PIK Debenture and the Shares were based on the then quoted market prices,
where  available,  along with present value  calculations  calculated using then
current values and rates for similar securities and other customary  comparative
factors.

         If the Stockholders do not approve the Proposal, the Company expects to
consider other financing alternatives for the Repurchase.  Such alternatives may
include debt financings in addition to the Senior Notes or equity  financings on
terms  less  favorable  to the  Company  than  those  described  in  this  Proxy
Statement.

         If the Funding  Conditions are not satisfied by September 30, 1999, the
Company  will be required to redeem the Senior  Notes for 101% of the  principal
amount plus accrued and unpaid interest, if any, to the date of redemption. As a
result of fees paid and expenses incurred in connection with the offering of the
Senior Notes and the receipt of bank consents for the  Repurchase,  and interest
and premium  payable on the Senior  Notes,  if the Company is required to redeem
the Senior Notes the Company estimates that it will incur interest costs, net of
tax, of $2.0 million and an extraordinary loss, net of tax, of $8.0 million.

         Stockholders are advised to read the financial and other information of
the Company incorporated by reference into this Proxy Statement.

TERMS OF THE PIK DEBENTURE

         In connection with the Acquisition,  the Company issued a PIK Debenture
to LTI in the original  principal amount of  $350,000,000.  The principal of the
PIK  Debenture  is payable on May 15,  2009,  subject  to earlier  mandatory  or
optional prepayment and any acceleration of its maturity date upon default.  The
PIK Debenture  bears interest at the fixed rate of 5% per annum.  Until April 8,
2000, interest on the outstanding principal balance of the PIK Debenture accrues
at the 5% rate, but is only payable in shares of Common Stock.  After such date,
at the election of the Company,  payments due on the PIK Debenture  (except upon
an optional early redemption),  including any accrued interest or principal, may
be made in shares of Common Stock or cash.  The number of shares of Common Stock
for each such  payment  is  calculated  based on the  dollar  amount of  accrued
interest or principal due divided by the average of the daily closing  prices of
a share of  Common  Stock on the New York  Stock  Exchange  for ten  consecutive
trading days  selected by the Company  commencing  not more than 20 trading days
before, and ending not later than, the date such payment is due. Interest on the
outstanding  principal  balance of the PIK Debenture is payable  semiannually on
November 15 and May 15,  beginning on November 15, 1997 and continuing until the
payment in full of the PIK Debenture.

         Beginning on May 15, 2002, and continuing  until the business day prior
to the  repayment of the PIK  Debenture,  the PIK Debenture is  convertible,  in
whole or in part, at the option of the holder, into shares of Common Stock, at a
price  equal to the  conversion  price  (the  "Conversion  Price") of $15.00 per
share, subject to anti-dilution adjustments.


                                      -11-
<PAGE>



         During the period  commencing  on May 15, 2002,  and  continuing  until
maturity, the Company has the option to prepay the PIK Debenture, in whole or in
part,  in cash,  at the face amount of the PIK  Debenture  if the last  reported
sales  price of a share of  Common  Stock,  as  reported  by the New York  Stock
Exchange,  equals or  exceeds  120% of the  Conversion  Price for a period of at
least  ten  consecutive  trading  days  prior  to  the  date  of  such  proposed
prepayment.

         Subject  to the  subordination  provisions  of the PIK  Debenture,  the
maturity of the PIK Debenture may be accelerated in the event a default  occurs,
with defaults including:

         (i) failure by the Company to pay the principal or accrued interest,

         (ii) the  voluntary or  involuntary  bankruptcy of the Company or other
         insolvency proceedings involving the Company, and

         (iii) the acceleration of the maturity of amounts outstanding under the
         Company's principal credit facility as a result of a default under such
         facility.

         The  PIK  Debenture  ranks  junior  in  right  of  payment  to  amounts
outstanding  under the Company's  principal credit facility and to substantially
all other  indebtedness of the Company except amounts owed (other than to banks,
insurance  companies and other  financing  institutions  and  obligations  under
capitalized  leases) for goods,  materials,  services or operating  lease rental
payments in the ordinary course of business or for compensation to employees and
any liability for federal, state, provincial, local or other taxes owed or owing
by the Company.

RECOMMENDATION OF THE BOARD

         The Board has determined that the approval of the Proposal is advisable
and in the best interests of the Company and the Stockholders,  has approved the
Proposal and recommends to the Stockholders  that you vote "FOR" approval of the
Proposal.

         Messrs. Bullock and Haworth, members of the Board who are also officers
of Laidlaw, did not participate in the Board vote with respect to the Repurchase
or the Proposal.  Mr. John Grainger,  also an officer of Laidlaw,  resigned from
the  Board  on  March  30,  1999,  prior  to the  Board's  consideration  of the
Repurchase and the Proposal.  All of the other Board members,  Messrs.  Rollins,
Sr., Rollins, Jr., Tippie,  Winger,  Thomas, Jr., Wrenn, Wareham and Luba, voted
to approve the Repurchase and the Proposal.

                              PRINCIPAL ACCOUNTANTS

         The Company expects that representatives of PricewaterhouseCoopers LLP,
independent public accountants for the Company, will attend the Special Meeting,
will have the  opportunity  to make a statement if they desire to do so and will
be available to respond to appropriate questions.



                                      -12-
<PAGE>


                PROPOSALS FOR 1999 ANNUAL MEETING OF STOCKHOLDERS

         Stockholders who intend to present  proposals for  consideration at the
Company's  1999  Annual  Meeting  are  advised  that any such  proposal  must be
received by the  Secretary of the Company no later than the close of business on
June 29, 1999, if such  proposal is to be considered  for inclusion in the proxy
statement and form of proxy relating to that meeting.

         If any Stockholder's  proposal is received after September 12, 1999 the
Company's  proxies  for the  1999  Annual  Meeting  may  exercise  discretionary
authority with respect to such proposal at the 1999 Annual  Meeting  without any
reference to such proposal being made in the proxy statement for such meeting.

                                 OTHER BUSINESS

         The Board is not aware of any other matter which will be presented  for
action at the Special  Meeting,  but if any other  business is properly  brought
before the Special  Meeting,  it is intended that the proxies received from this
solicitation will be voted by the persons named in the attached form of proxy in
accordance with their best judgment.

                              AVAILABLE INFORMATION

         The  Company  is  subject  to  the  informational  requirements  of the
Securities  Exchange Act of 1934,  and in accordance  therewith  files  reports,
proxy  statements  and  other  information  with  the  Securities  and  Exchange
Commission  (the  "Commission").  Copies of such reports,  proxy  statements and
other  information  filed with the Commission may be inspected and copied at the
public reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street,  N.W.,  Judiciary  Plaza,  Washington,  D.C.  20549 and at the following
Regional Offices of the Commission:  7 World Trade Center, Suite 1300, New York,
New York  10048 and  Citicorp  Center,  500 West  Madison  Street,  Suite  1400,
Chicago, Illinois 60661-2511.  Copies of such material may also be obtained from
the  Public  Reference  Section of the  Commission  at 450 Fifth  Street,  N.W.,
Judiciary  Plaza,  Washington,  D.C. 20549 at prescribed  rates.  The public may
obtain  information on the operation of the Public Reference Room by calling the
Commission at 1-800-SEC-0330.  The Company files information electronically with
the Commission. The Commission maintains an Internet site that contains reports,
proxy and information  statements and other  information  regarding issuers that
file  electronically  with  the  Commission.  The  address  of the  Commission's
Internet  site is  http://www.sec.gov.  The Common Stock is listed and traded on
the New York Stock  Exchange.  The Common  Stock is also  traded on the  Pacific
Exchange,  Inc.  Reports,  proxy statements and other  information  filed by the
Company  with the  Commission  may be  inspected  at the offices of the New York
Stock Exchange, 20 Broad Street, New York, New York 10005, and at the offices of
the Pacific Exchange, Inc. at 301 Pine Street, San Francisco, California 94104.


                                      -13-
<PAGE>

                           INCORPORATION BY REFERENCE

         The  following  documents  filed  with the  Commission  by the  Company
pursuant  to the  Exchange  Act are  incorporated  by  reference  in this  Proxy
Statement:

         1. The  Company's  Annual Report on Form 10-K for the fiscal year ended
         August 31, 1998;

         2. The Company's  Quarterly  Report on Form 10-Q for the fiscal quarter
         ended November 30, 1998;

         3. The Company's  Quarterly  Report on Form 10-Q for the fiscal quarter
         ended February 28, 1999;

         4. The Company's  Quarterly  Report on Form 10-Q for the fiscal quarter
         ended May 31, 1999;

         5. The Company's  Current Reports on Form 8-K dated April 20, 1999, May
         5, 1999, May 10, 1999, May 17, 1999 and May 27, 1999;

         6. The Audited  Financial  Statements for the three years ended January
         3, 1998 and the Unaudited Interim  Financial  Statements for the period
         ended March 28, 1998 of Safety-Kleen  Systems,  Inc. (formerly known as
         Safety-Kleen Corp.) filed in Safety-Kleen Services, Inc.'s Registration
         Statement on Form S-4 (No. 333-57587) filed on October 23, 1998.

         All  documents  subsequently  filed by the Company  pursuant to Section
13(a),  13(c),  14 or 15(d) of the Exchange Act  subsequent  to the date of this
Proxy  Statement and prior to the date of the Special Meeting shall be deemed to
be  incorporated  by reference into this Proxy  Statement and to be part of this
Proxy  Statement  from the date of filing  of such  documents.  All  information
appearing  in  this  Proxy  Statement  is  qualified  in  its  entirety  by  the
information and financial statements  (including the notes thereto) appearing in
the documents incorporated by reference into this Proxy Statement. Any statement
contained in a document  incorporated  or deemed to be incorporated by reference
into this Proxy Statement shall be modified or superseded,  for purposes of this
Proxy  Statement,  to the  extent  that a  statement  contained  in  this  Proxy
Statement  or  in  any  subsequently   filed  document  that  is  deemed  to  be
incorporated  into  this  Proxy  Statement   modifies  or  supersedes  any  such
statement.  Any statement so modified or superseded shall not be deemed,  except
as so modified or superseded, to constitute a part of this Proxy Statement.

            CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

         Certain statements  contained in this Proxy Statement  (particularly in
"The  Proposal"),  any statements  preceded by,  followed by or  incorporated by
reference into or that include the words "believes," "expects," "anticipates" or
similar expressions, and other statements contained or incorporated by reference
herein  regarding  matters that are not historical  facts, are or may constitute
forward-looking  statements  (as such term is defined in the Private  Securities
Litigation Reform Act of 1995). Because such statements are subject to risks and
uncertainties,  actual


                                      -14-
<PAGE>

results  may  differ   materially  from  those  expressed  or  implied  by  such
forward-looking  statements.  The risks and uncertainties  that may cause actual
results to differ include,  among others,  general  economic  conditions,  risks
associated  with  acquisitions,  fluctuations  in operating  results  because of
acquisitions  and  variations  in stock prices,  changes in applicable  federal,
state and local  laws and  regulations,  especially  environmental  regulations,
alternate  and  emerging   technologies,   competition  and  pricing  pressures,
overcapacity   in  the   industry,   seasonal   fluctuations   due  to  weather,
uncertainties of litigation, and risks associated with the operation, growth and
integration of newly  acquired  businesses.  As a result of these  factors,  the
expected effects of the Repurchase could vary from those described in this Proxy
Statement,  the  Company's  revenue  and income  could vary  significantly  from
quarter to quarter,  and past financial  performance  should not be considered a
reliable  indicator of future  performance.  Stockholders  are  cautioned not to
place undue reliance on such statements, which speak only as of the date hereof.
The Company  undertakes no obligation to release publicly any revisions to these
forward-looking  statements to reflect  events or  circumstances  after the date
hereof or to reflect the occurrence of unanticipated events.


                                      -15-
<PAGE>

                                                                      APPENDIX A

                               SAFETY-KLEEN CORP.

         This proxy is  solicited  by and on behalf of the Board of Directors of
Safety-Kleen  Corp. (the "Company").  The undersigned hereby appoints Kenneth W.
Winger,  Paul R.  Humphreys and Henry H. Taylor or any of them,  the attorney or
attorneys  and  proxy  or  proxies  of  the  undersigned   with  full  power  of
substitution  to attend the Special Meeting of Stockholders of the Company to be
held at 1301 Gervais Street,  Suite 300 Columbia,  South Carolina,  at 9:00 a.m.
local time, on Friday,  August 27, 1999, and at any  postponement or adjournment
thereof,  to vote all shares of common  stock,  $1.00 par value,  of the Company
(the  "Common  Stock")  that the  undersigned  shall be entitled  to vote.  Said
proxies are  instructed to vote on the matters set forth in the proxy  statement
as specified on the reverse.

         The  Board of  Directors  recommends  a vote  "FOR" the  proposal  (the
"Proposal") to approve the issuance of shares (the "Shares") of Common Stock, to
Laidlaw  International  Finance  Corporation  ("LIFC") or another  affiliate  of
Laidlaw  Inc.,  in  connection  with  the  Company's  proposed  repurchase  (the
"Repurchase")  of its  outstanding  $350  million  5%  Subordinated  Convertible
Pay-In-Kind  Debenture due 2009 (the "PIK  Debenture")  held by LIFC. The Shares
include 11,320,755 shares of Common Stock plus an additional number of shares of
Common  Stock in payment  of accrued  and  unpaid  interest  on the  outstanding
principal balance of the PIK Debenture to the date of the Repurchase.

         This proxy when  properly  signed and dated will be voted in the manner
directed  herein by the undersigned  stockholder.  IF NO DIRECTION IS MADE, THIS
PROXY WILL BE VOTED "FOR" THE PROPOSAL.

             ---------------------------------------------------
                              FOLD AND DETACH HERE

                             [this is reverse side]

[ X ] Please mark your votes as in this example.

                                        FOR          AGAINST          ABSTAIN

1.  Approval of the Proposal:           [  ]           [  ]             [  ]

2. In their  discretion,  the  proxies  are  authorized  to vote upon such other
business as may properly come before the meeting.

Please sign exactly as name  appears to the left.  When shares are held by joint
tenants,  both should sign. When signing as attorney,  executor,  administrator,
trustee or guardian,  please give full title.  If a corporation,  please sign in
full corporate name by authorized officer. If a partnership, sign in partnership
name by authorized person. If more than one trustee, all should sign. This proxy
may be revoked any time prior to its exercise.

____________________________________(L.S.)

____________________________________(L.S.)
SIGNATURE(S)               DATE:

                     PLEASE SIGN, DATE AND RETURN THIS PROXY

         PROMPTLY---------------------------------------------------------

                              FOLD AND DETACH HERE


<PAGE>




                               SAFETY-KLEEN CORP.

Dear Stockholder:

         We encourage you to take  advantage of two new and  convenient  ways by
which you can grant a proxy to vote your  shares.  You can grant a proxy to vote
your shares  electronically  by telephone or via the Internet,  which eliminates
the need to return the proxy card.

         By Telephone: To grant a proxy to vote your shares by telephone,  use a
touch-tone telephone and call the following toll-free number: 1-877-PRX-VOTE, 24
hours a day, 7 days a week.  Insert the Control Number printed in the box above,
just below the perforation. Follow the simple recorded instructions.

         By Internet:  To grant a proxy to vote your shares via the Internet, go
to website  www.eproxyvote.com/SK.  Insert the Control Number printed in the box
above,  just below the  perforation  and then  follow  the simple  instructions.
Please be aware that if you grant a proxy to vote your shares over the Internet,
you may incur costs such as  telecommunication  and Internet  access charges for
which you will be responsible.

         The Internet and telephone  facilities will be available until midnight
on August 26, 1999 the day before the Special Meeting.

         Do Not Return  Proxy If You Are  Submitting  Your Proxy By Telephone or
The Internet

<PAGE>


                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                            SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934
                              (Amendment No. ____)

Filed by the Registrant [x]
Filed by a Party other than the Registrant [ ]

Check the appropriate box:

[ ]      Preliminary Proxy Statement
[ ]      Confidential,  for  Use  of the  Commission  Only (as permitted by Rule
         14a-6(e)(2))
[X]      Definitive Proxy Statement
[ ]      Definitive  Additional Materials
[ ]      Soliciting Material Pursuant to 240.14a-11(c) or 240.14a-12


         SAFETY-KLEEN CORP.
- --------------------------------------------------------------------------------
         (Name of Registrant as Specified In Its Charter)

         N/A
- --------------------------------------------------------------------------------
         (Name of Person(s) Filing Proxy Statement if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):
[X]      No fee required

[ ] Fee computed on table below per Exchange Act Rules 14(a)-6(i)(4) and 0-11.

         1)      Title of each class of securities to which transaction applies:

                 --------------------------------------------------------------

         2)      Aggregate number of securities to which transaction applies:
                 -------------------------------------------------------- -----

         3)      Per  unit  price  or other  underlying  value  of  transaction
                 computed  pursuant  to  Exchange  Act Rule 0-11 (Set forth the
                 amount on which the filing fee is calculated  and state how it
                 was determined):
                 ---------------------------------------------------------------

         4)       Proposed maximum aggregate value of transaction:
                  --------------------------------------------------------------

         5)       Total fee paid:
                  --------------------------------------------------------------


[ ]      Fee paid previously with preliminary materials.

[ ]      Check box if any part of the fee is offset as  provided  by  Exchange
         Act Rule  0-11(a)(2)  and identify the filing for which the  offsetting
         fee was paid  previously.  Identify the previous filing by registration
         statement number, or the Form or Schedule and the date of its filing.


         1)       Amount Previously Paid:
                  --------------------------------------------------------------

         2)       Form, Schedule or Registration Statement No.:
                  --------------------------------------------------------------

         3)       Filing Party:
                  --------------------------------------------------------------

         4)       Date Filed:
                  --------------------------------------------------------------


<PAGE>



                               DATED JULY 30, 1999


                            [SAFETY-KLEEN CORP. LOGO]





                                                                July 30, 1999



Dear Stockholder:


         You  are  cordially   invited  to  attend  a  Special  Meeting  of  the
stockholders of Safety-Kleen  Corp.  (the  "Company"),  to be held on August 27,
1999, at 9:00 a.m.  local time,  at 1301 Gervais  Street,  Suite 300,  Columbia,
South Carolina 29201.

         At the  Special  Meeting  you will be asked to approve a proposal  (the
"Proposal") relating to the issuance of shares (the "Shares") of common stock of
the  Company,  par value  $1.00 per  share  (the  "Common  Stock"),  to  Laidlaw
International Finance Corporation ("LIFC") or another affiliate of Laidlaw Inc.,
in connection with the Company's  proposed  repurchase (the "Repurchase") of its
outstanding $350 million 5% Subordinated  Convertible  Pay-In-Kind Debenture due
2009 (the "PIK Debenture") held by LIFC. The Shares include 11,320,755 shares of
Common Stock plus an  additional  number of shares of Common Stock in payment of
accrued and unpaid  interest  on the  outstanding  principal  balance of the PIK
Debenture to the date of the Repurchase.

         The Board of Directors has determined that the approval of the Proposal
is advisable and in the best interests of the Company and its Stockholders,  has
approved the Proposal and  recommends  to the  Stockholders  that you vote "FOR"
approval of the Proposal.


         Additional  information  regarding  the  Proposal is  contained  in the
accompanying  Proxy  Statement.  In view of the  importance of the actions to be
taken  at the  Special  Meeting,  we urge  you to read  the  accompanying  Proxy
Statement carefully,  and regardless of the number of shares you own, we request
that you complete, sign, date and return the enclosed proxy card promptly in the
accompanying  prepaid envelope.  You may, of course,  attend the Special Meeting
and vote in person, even if you have previously returned your proxy card.

         We urge you to vote "FOR" approval of the Proposal.

                                        Sincerely,


                                        /s/ Kenneth W. Winger

<PAGE>

                                        Kenneth W. Winger
                                        President and Chief Executive Officer

<PAGE>


                               SAFETY-KLEEN CORP.
                         1301 Gervais Street, Suite 300
                         Columbia, South Carolina 29201

                            ------------------------

                    NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

                          To Be Held On August 27, 1999

                            ------------------------

                    TO THE STOCKHOLDERS OF SAFETY-KLEEN CORP.


         Notice is hereby given that a special  meeting (the "Special  Meeting")
of the stockholders of Safety-Kleen Corp. (the "Company") will be held on August
27, 1999, at 9:00 a.m. local time, at 1301 Gervais Street,  Suite 300, Columbia,
South Carolina 29201, for the following purposes:

         1. To approve the issuance of shares (the  "Shares") of common stock of
the  Company,  par value  $1.00 per  share  (the  "Common  Stock"),  to  Laidlaw
International Finance Corporation ("LIFC") or another affiliate of Laidlaw Inc.,
in connection with the Company's  proposed  repurchase (the "Repurchase") of its
outstanding $350 million 5% Subordinated  Convertible  Pay-In-Kind Debenture due
2009 (the "PIK Debenture") held by LIFC. The Shares include 11,320,755 shares of
Common Stock plus an  additional  number of shares of Common Stock in payment of
accrued and unpaid  interest  on the  outstanding  principal  balance of the PIK
Debenture to the date of the Repurchase.


         2. To  transact  such other  business as may  properly  come before the
Special Meeting or any adjournment or postponement thereof.


         The Board of Directors has fixed the close of business on July 19, 1999
as the record date for the  determination  of  stockholders  entitled to receive
notice  of and to  vote  at  the  Special  Meeting  and  at any  adjournment  or
postponement thereof.

         From August 16, 1999 until the date of the Special  Meeting,  a list of
stockholders  entitled  to vote at the Special  Meeting  will be  available  for
inspection by  stockholders  of record during business hours at the place of the
Special Meeting and also will be available at the Special Meeting.


         Your attention is directed to the Proxy  Statement  submitted with this
Notice.


         Please  complete,  date and sign the enclosed  proxy card and return it
promptly in the enclosed  envelope whether or not you plan to attend the Special
Meeting. If you attend the Special Meeting,  you may vote in person if you wish,
even if you have previously returned your proxy card.

                         -------------------------------


By Order of the Board of Directors               /s/ Henry H. Taylor
Columbia, South Carolina                         Henry H. Taylor, Secretary
- ----------



<PAGE>






                               SAFETY-KLEEN CORP.
                         1301 Gervais Street, Suite 300
                         Columbia, South Carolina 29201

                                 PROXY STATEMENT
                         ------------------------------

                         Special Meeting of Stockholders


                                 August 27, 1999

         This Proxy Statement is being mailed to holders (the "Stockholders") of
common stock,  par value $1.00 per share (the "Common  Stock"),  of Safety-Kleen
Corp.  (the "Company") as of the close of business on July 19, 1999 (the "Record
Date") in connection with the  solicitation of proxies by the Board of Directors
of the Company (the "Board") for use at a special meeting of the Stockholders to
be held at 1301 Gervais  Street,  Suite 300,  Columbia,  South Carolina 29201 on
August 27, 1999, at 9:00 a.m. local time, and at any adjournment or postponement
thereof (the "Special Meeting").

         At the  Special  Meeting  you will be asked to approve a proposal  (the
"Proposal") relating to the issuance of shares (the "Shares") of common stock of
the  Company,  par value  $1.00 per  share  (the  "Common  Stock"),  to  Laidlaw
International Finance Corporation ("LIFC") or another affiliate of Laidlaw Inc.,
in connection with the Company's  proposed  repurchase (the "Repurchase") of its
outstanding $350 million 5% Subordinated  Convertible  Pay-In-Kind Debenture due
2009 (the "PIK Debenture") held by LIFC. The Shares include 11,320,755 shares of
Common Stock plus an  additional  number of shares of Common Stock in payment of
accrued and unpaid  interest  on the  outstanding  principal  balance of the PIK
Debenture to the date of the Repurchase.

         This  Proxy  Statement  and form of Proxy  are  first  being  mailed or
otherwise delivered to Stockholders on or about July 30, 1999.


         The Board has determined that the approval of the Proposal is advisable
and in the best interests of the Company and the Stockholders,  has approved the
Proposal and recommends to the Stockholders  that you vote "FOR" approval of the
Proposal.

         You are cordially invited to attend the Special Meeting.  If you cannot
be present in person,  please sign and date the enclosed proxy and promptly mail
it in the enclosed return postage paid envelope.  Any stockholder giving a proxy
has the right to revoke it any time before such proxy is voted.

         Your vote is  important.  You are  urged to date and sign the  enclosed
proxy and return it in the enclosed  postage paid  envelope as soon as possible.
You may  revoke  the  proxy at any time  prior to its use by  delivering  to the
Company a written  notice of revocation or a duly executed proxy bearing a later
date.  Any  stockholder  who has  executed a proxy but is present at the Special
Meeting and who wishes to vote in person may do so by revoking  his,  her or its
proxy as described in the preceding sentence.
                         -------------------------------


<PAGE>


                THE DATE OF THIS PROXY STATEMENT IS JULY 30, 1999


<PAGE>


                                   THE COMPANY

         The Company  provides  industrial  waste services  designed to collect,
process,  recycle and dispose of hazardous and  industrial  waste  streams.  The
Company  provides  these  services  from  numerous   collection   locations  and
processing  facilities  located in the United States and Canada. The Company was
incorporated in Delaware in 1968.

         The  Company's  principal  executive  office is located at 1301 Gervais
Street,  Suite 300,  Columbia,  South Carolina 29201 and its telephone number is
803-933-4200.


         The Common  Stock is listed  and traded on the New York Stock  Exchange
and on the Pacific  Exchange,  Inc.  On July 23,  1999 the closing  price of the
Common Stock on the New York Stock Exchange was $12.00.


                                     PROXIES

        The  accompanying  form of proxy is for use at the  Special  Meeting.  A
Stockholder  may use this proxy if he or she is unable to attend the  meeting in
person or if he or she wishes to have his or her  shares  voted by proxy even if
he or she attends the meeting. The proxy may be revoked in writing by the person
giving  it any time  before  the  proxy is  exercised  by  giving  notice to the
Company's  Secretary,  or by  submitting a proxy having a later date, or by such
person  appearing  at the  meeting and  electing  to vote in person.  All shares
represented  by valid  proxies  received in this  solicitation,  and not revoked
prior to their exercise,  will be voted in the manner specified in such proxies.
If no  specification  is made in the proxy,  the proxy  will be voted  "FOR" the
Proposal. The Board is not aware of any other matters which may be presented for
action at the Special Meeting,  but if other matters do come properly before the
Special Meeting shares  represented by proxies in the accompanying  form will be
voted by the persons named in the proxy in accordance with their best judgment.


         The Company  will bear the costs of  solicitation  of proxies  from the
Stockholders.  Solicitation  of  proxies  may be made in  person,  by mail or by
telephone, by officers,  directors and regular employees of the Company who will
not be specially  compensated in such regard.  Nominees,  fiduciaries  and other
custodians will be requested to forward solicitation materials to the beneficial
owners and secure  their  voting  instructions  and will be  reimbursed  for the
reasonable  expenses  incurred  in sending  proxy  materials  to the  beneficial
owners.  In  addition,  the  Company has  engaged  the  services of  ChaseMellon
Shareholder Services to solicit proxies and will pay such proxy soliciting agent
$4500.00 plus expenses in connection therewith. Solicitation by such firm may be
by mail, personal interview, telephone, fax or telegraph. Arrangements also will
be made with brokerage firms and other  custodians,  nominees and fiduciaries to
forward proxy  solicitation  material to the  beneficial  owners of Common Stock
held of record by such persons,  and the Company will  reimburse  such brokerage
firms,  custodians,   nominees  and  fiduciaries  for  reasonable  out-of-pocket
expenses incurred by them in connection therewith.




<PAGE>

                                     VOTING


         The Board has fixed the close of  business  on the Record  Date for the
determination  of Stockholders  entitled to receive notice of and to vote at the
Special Meeting.  As of the Record Date, there were a total of 88,939,049 shares
of the Common Stock  outstanding  and  entitled to vote at the Special  Meeting.
Each  Stockholder is entitled to one vote for each share of Common Stock held of
record by such  Stockholder on the Record Date on each matter to come before the
Special Meeting.  The Company's  Certificate of Incorporation and By-laws do not
provide for cumulative voting.


VOTE REQUIRED

         Under Rule 312 of the New York Stock Exchange, approval of the Proposal
requires  the  affirmative  vote of a  majority  of the votes cast in respect of
outstanding  shares of Common  Stock at the  Special  Meeting;  provided  that a
majority of the votes  entitled to be cast by all  outstanding  shares of Common
Stock are cast at the Special  Meeting.  Under  Delaware  law and the  Company's
Certificate of Incorporation and By-Laws, the affirmative vote of the holders of
a majority of the shares of Common Stock  represented  in person or by proxy and
entitled to vote at the Special  Meeting is  necessary  to approve or ratify any
act of the Company or to transact any other business which may be brought before
the Special Meeting.

         Abstentions  and broker  non-votes with respect to any proposal  coming
before the Special Meeting,  including the Proposal,  will be counted as present
for purposes of  determining  the existence of a quorum,  but will not be deemed
votes cast for  purposes of  determining  the total  number of shares of which a
majority  is  required  for any  purpose.  As a result,  abstentions  and broker
non-votes will have the same legal effect on the outcome as a vote "against" the
Proposal,  even though a Stockholder or other interested  parties  analyzing the
results of the voting may interpret such a vote differently.

PRINCIPAL STOCKHOLDER


         Laidlaw,   which   beneficially  owns   approximately   36.15%  of  the
outstanding  Common Stock as of July 20, 1999,  has informed the Company that it
intends  to vote for  approval  of the  Proposal  at the  Special  Meeting.  See
"Principal  Stockholders and Management  Ownership," "Certain  Relationships and
Related Transactions" and "The Proposal."


DISSENTERS' OR APPRAISAL RIGHTS

         The Stockholders of the Company have no dissenters' or appraisal rights
in connection with the Proposal.

<PAGE>

                 PRINCIPAL STOCKHOLDERS AND MANAGEMENT OWNERSHIP

PRINCIPAL STOCKHOLDER


      The  following  table  sets  forth  the only  Stockholders  which,  to the
knowledge of management of the Company,  were beneficial  owners of five percent
(5%) or more of the outstanding  shares of Common Stock as of July 20, 1999. The
shareholdings of Laidlaw are based on information  provided by such Stockholder.
The  shareholdings of Mellon Bank Corporation are based solely on a Schedule 13G
Report  filed  with the  Securities  and  Exchange  Commission  by  Mellon  Bank
Corporation in January 1999.


                                AMOUNT AND NATURE OF          PERCENT OF CLASS
     NAME                             OWNERSHIP              BENEFICIALLY OWNED


Laidlaw Inc. (1)                      32,148,674                    36.15%
3221 North Service Road
Burlington, Ontario
L7R 3Y8
CANADA




Mellon Bank Corporation                5,504,040                     6.19%
One Mellon Bank Center

Pittsburgh, Pennsylvania 15258
- -----------------------------------

(1) Shares of Common Stock shown as owned by Laidlaw,  except for 31 shares, are
held of record by Laidlaw Finance (Barbados) Ltd.

MANAGEMENT OWNERSHIP


         The  following  table  sets  forth as of July 20,  1999,  the number of
shares  of  Common  Stock  beneficially  owned  by (i)  each  of  the  Company's
directors,  (ii) the Chief Executive  Officer of the Company,  (iii) each of the
Company's other executive officers and (iv) all directors and executive officers
of the Company as a group.



                                     AMOUNT AND NATURE OF      PERCENT OF CLASS

         NAME                              OWNERSHIP          BENEFICIALLY OWNED

James R. Bullock (1), (2), (3).............  9,020                   *
Leslie W. Haworth (1), (2), (4)............  3,937                   *
John W. Rollins, Jr. (1), (5), (6)......... 90,704                   *
John W. Rollins, Sr. (1), (6), (7).........958,289                   1%
David E. Thomas, Jr. (1), (6)..............  2,645                   *
Henry B. Tippie (1), (6), (8)..............576,962                   *
James L. Wareham (1), (6)..................  2,895                   *


<PAGE>


Grover C. Wrenn (1), (6)...................  6,395                    *
Kenneth W. Winger (9), (10)................ 42,211                    *
Michael J. Bragagnolo (9).................. 22,500                    *
Paul R. Humphreys (9)......................  9,000                    *
Henry H. Taylor (9), (10)..................  3,557                    *
Robert W. Luba (11)........................  5,000                    *


All directors and
executive officers as a group

(13 persons).............................1,733,115                  1.95%


- ------------------------

*        Signifies less than 1%


(1) Includes 2,000 shares  subject to presently  exercisable  options.  Does not
include 13,000 shares which are subject to vesting requirements  pursuant to the
Directors Stock Option Plan. Under such Plan,  options become exercisable at the
rate of 20% per  year,  on or about one year  after the date of grant,  with all
options becoming fully vested on or about five years after the date of grant.


(2)  Messrs.  Bullock  and Haworth  are  officers  of  Laidlaw.  See  "Principal
Stockholders" for information  regarding the beneficial  ownership of the Common
Stock by Laidlaw.

(3)  Includes  770  shares of  restricted  stock  granted  on January 5, 1999 in
accordance  with the  Nonemployee  Director  Stock Plan. The shares do not fully
vest until January 5, 2000. Includes 6,250 shares owned by Mr. Bullock's spouse.
Does not include 12,500 shares indirectly owned by Midcorp (J.P.C.) Limited,  as
to which shares Mr. Bullock disclaims any beneficial ownership.

(4)  Includes  687  shares of  restricted  stock  granted  on January 5, 1999 in
accordance  with the  Nonemployee  Director  Stock Plan. The shares do not fully
vest until January 5, 2000.


(5) Includes  46,528 shares held by Mr. Rollins as co-trustee.  Does not include
1,547  shares  owned by Mr.  Rollins'  wife,  as to  which  shares  Mr.  Rollins
disclaims any beneficial ownership.

<PAGE>

(6)  Includes  645  shares of  restricted  stock  granted  on January 5, 1999 in
accordance  with the  Nonemployee  Director  Stock Plan. The shares do not fully
vest until January 5, 2000.


(7) Does not include 58,937 shares owned by Mr.  Rollins' wife and 30,717 shares
held by his wife as  custodian  for his minor  children,  as to which shares Mr.
Rollins disclaims any beneficial ownership.


(8) Includes 242,172 shares held by Mr. Tippie as co-trustee;  6,500 shares held
by him as trustee;  and 7,500  shares in which a wholly owned  corporation  over
which he has sole  voting  power has a  beneficial  partnership  interest  of 75
shares and voting right for 7,500 shares. Does not include 5,750 shares owned by
Mr.  Tippie's  wife,  as to which shares Mr.  Tippie  disclaims  any  beneficial
ownership.

(9) Includes shares subject to presently  exercisable options.  Does not include
remaining shares which are subject to vesting requirements  pursuant to the 1997
Stock Option Plan. Options become exercisable at the rate of 20% per year, on or
about one year after the date of grant,  with all options  becoming fully vested
on or about five years after the date of grant.

(10) Includes holdings of Common Stock held through the Company's 401(k) plan.


(11) Does not  include  7500 shares  which are  subject to vesting  requirements
pursuant to the Directors  Stock Option Plan.  Under such Plan,  options  become
exercisable  at the rate of 20% per year, on or about one year after the date of
grant,  with all options  becoming fully vested on or about five years after the
date of grant.  Mr.  Luba  became a  director  on March  30,1999  following  the
resignation of Mr.
John Grainger.


<PAGE>

                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

LAIDLAW EXECUTIVE OFFICERS AND STOCK OWNERSHIP


         James R. Bullock and Leslie W. Haworth,  directors of the Company,  are
executive  officers of  Laidlaw.  See  "Principal  Stockholders  and  Management
Ownership  --  Management  Ownership."  Mr.  John  Grainger,  also an officer of
Laidlaw,  resigned  from the  Board  on March  30,  1999,  prior to the  Board's
consideration of the Repurchase and the Proposal.

         As of July 20, 1999, Laidlaw beneficially owned, directly or indirectly
through affiliates,  32,148,674 shares of Common Stock, or approximately  36.15%
of the  outstanding  Common  Stock.  Assuming  conversion  by Laidlaw of the PIK
Debenture  in  accordance  with  its  terms,  Laidlaw  would  own,  directly  or
indirectly  through  affiliates,  approximately  54.9  million  shares of Common
Stock, or  approximately  49.2% of the then outstanding  Common Stock,  assuming
that Laidlaw  retains all of the Common Stock owned by it. Upon  issuance of the
Shares in connection with the Repurchase,  Laidlaw is expected to own,  directly
or  indirectly  through its  affiliates,  approximately  43.9 million  shares of
Common Stock,  or  approximately  43.59% of the then  outstanding  Common Stock,
assuming  that  Laidlaw  retains  all of  the  Common  Stock  owned  by it.  See
"Principal Stockholders and Management Ownership -- Principal Stockholder." (The
total  number of shares of Common  Stock owned by Laidlaw  upon  issuance of the
Shares is based upon the assumption that the Shares include  415,525  additional
shares of Common Stock  issued in payment of accrued and unpaid  interest on the
PIK Debenture through the date of the Repurchase in accordance with the terms of
the PIK Debenture as described  under the caption "Terms of the PIK  Debenture."
This  assumption  is based upon an assumed  August 27, 1999 closing date for the
Repurchase and upon an average price per share of Common Stock of $12.00.


THE ACQUISITION

         In May 1997, the Company  acquired the hazardous and  industrial  waste
operations of Laidlaw (the "Acquisition").  The Acquisition was accounted for as
a reverse  acquisition  by the Company using the purchase  method of accounting.
The Acquisition involved:


         (i) the  issuance by the Company of 30 million  shares of Common  Stock
         and the PIK Debenture to Laidlaw; and


         (ii) the  payment  by the  Company  of  $349.1  million  in cash  ($400
         million, less debt of $50.9 million assumed) to Laidlaw.

<PAGE>

         Laidlaw acquired  approximately  67% of the Common Stock as a result of
the Acquisition. Laidlaw's holdings were subsequently diluted by the issuance of
shares  of  Common  Stock  in  connection  with  the  Company's  acquisition  of
Safety-Kleen in April 1998.

         LAIDLAW INDEMNITIES

         In connection with the Acquisition, Laidlaw and Laidlaw Transportation,
Inc. ("LTI"), a subsidiary of Laidlaw,  agreed,  subject to various limitations,
jointly  and  severally  to  indemnify  and hold  harmless  the  Company and its
affiliates from and against damages suffered by the Company resulting from or in
respect  of (i)  various  tax  obligations  and  liabilities,  (ii)  pre-closing
insurance  claims,  (iii) any breach or default in the performance by Laidlaw or
LTI of covenants and agreements in the purchase agreement for the Acquisition to
be performed on or after the closing of the Acquisition or of any representation
or warranty in such purchase  agreement which survives the closing to the extent
that damages therefrom exceed $2,000,000,  and (iv) any environmental  liability
or environmental  claim arising as a result of any act or omission by Laidlaw or
LTI, including any release, occurring prior to such closing.

         LAIDLAW GUARANTIES

         In connection with the  Acquisition,  Laidlaw entered into on behalf of
the Company  various  guaranties,  performance  guaranties,  bonds,  performance
bonds,  suretyship  arrangements,  surety  bonds,  credits,  letters  of credit,
reimbursement   agreements  and  other  undertakings,   deposit  commitments  or
arrangements  by which Laidlaw may be primarily,  secondarily,  contingently  or
conditionally  liable for  present or future  obligations  of the  Company.  The
Company  agreed to use its best efforts to cause Laidlaw to be fully and finally
released and discharged  from all further  liability or obligation in respect of
all such obligations  within six months following the date of the closing of the
Acquisition. As of the date hereof Laidlaw had been discharged from most of such
obligations.

<PAGE>

SERVICE ARRANGEMENTS


         Laidlaw and its  affiliates  have  provided  financial  and  management
services  to the  Company  and its  subsidiaries,  including  providing  general
liability and workers'  compensation  insurance and income tax management.  Such
service  arrangements  have  been  on  arms-length  terms  comparable  to  those
available in  transactions  with  unaffiliated  parties.  During the fiscal year
ended August 31, 1998, the Company paid Laidlaw $11.3 million on account of such
services.

OTHER RELATIONSHIPS


         In the ordinary  course of business,  the Company or its affiliates and
Laidlaw or  affiliates  of Laidlaw  have  entered from time to time into various
business  transactions and agreements wherein Laidlaw provided certain financial
and management  services to the Company or its  affiliates.  These services have
included providing general liability and workers' compensation insurance, income
tax management and treasury services.


RAYMOND JAMES & ASSOCIATES, INC.


         Raymond James & Associates,  Inc. acted as an initial  purchaser in the
offering of the  Company's  senior notes  described in "The Proposal -- Purposes
and Effects of the  Proposal -- The  Repurchase  and Related  Financing."  Since
September  1, 1997,  Raymond  James &  Associates,  Inc.  has acted as financial
advisor  to the  Company  for  various  transactions,  including  the  Company's
acquisition of Safety-Kleen, and is expected to continue to act in such capacity
in the  future.  David E.  Thomas,  Jr., a director,  is a Managing  Director of
Raymond James & Associates, Inc.




<PAGE>


                                  THE PROPOSAL


PURPOSES AND EFFECTS OF THE PROPOSAL

         NEW YORK STOCK EXCHANGE RULE 312

         The  purpose  of the  Proposal  is to permit  the  Company to issue the
Shares  to  LIFC or  another  affiliate  of  Laidlaw,  in  connection  with  the
Repurchase.  Stockholders  are not being  asked to approve the  Repurchase.  See
"Principal Stockholders and Management Ownership" and "Certain Relationships and
Related Transactions."


         Delaware law does not require stockholder  approval of any kind for the
issuance of the Shares or for the  Repurchase.  The Company is seeking  specific
approval of the Proposal to insure full compliance with the terms, to the extent
applicable,  of Rule  312 of the New York  Stock  Exchange.  Rule  312  requires
stockholder  authorization  in connection  with the issuance of shares of common
stock to  officers,  directors,  holders  of 5% or more of the  issuer's  voting
power,  and their  affiliates or other closely  related  persons,  if the common
stock so issued would  represent  more than 1% of the common  stock  outstanding
prior to such  issuance.  The Shares will  represent more than 12% of the Common
Stock outstanding prior to issuance of the Shares.


         If the Stockholders approve the Proposal, the Company currently intends
to seek  listing  approval of the Shares on the New York Stock  Exchange and the
Pacific Exchange,  Inc., repurchase the PIK Debenture for cash and the Shares as
set forth below and issue the Shares to LIFC or another affiliate of Laidlaw.

         THE REPURCHASE AND RELATED FINANCING


         The PIK  Debenture  is held by LIFC,  which is an affiliate of Laidlaw.
The Company  currently  intends to effect the  Repurchase  for a purchase  price
consisting  of (i) $200  million  in cash and (ii)  the  Shares  (consisting  of
11,320,755  shares of Common Stock plus an additional number of shares of Common
Stock in payment of accrued  and unpaid  interest on the  outstanding  principal
balance  of the PIK  Debenture  to the  date of the  Repurchase,  calculated  in
accordance with the terms of the PIK Debenture).  The Company,  Laidlaw and LIFC
have entered into a securities  purchase agreement to effect the Repurchase (the
"Securities  Purchase  Agreement").  The Securities  Purchase Agreement contains
certain  customary  representations,  warranties  and covenants  relating to the
Repurchase.  Under the  Securities  Purchase  Agreement  the Board is  required,
subject to its  fiduciary  duties,  to call the Special  Meeting  and  recommend
approval of the Proposal.  The Company's obligation to consummate the Repurchase
is conditioned upon, among other things,  stockholder  approval of the Proposal.
Other  conditions to the  Company's  obligation  to  consummate  the  Repurchase
included (i) the satisfactory  completion of a financing for the cash portion of
the purchase price in the Repurchase,  which was completed in May 1999, and (ii)
the receipt of required  bank  consents,  which were  obtained in May 1999.  The
Securities Purchase Agreement may be terminated by mutual consent of the parties
or by any party if the  closing of the  Repurchase  does not occur by August 31,
1999.



<PAGE>



         The Company  intends to finance the cash portion of the purchase  price
with a portion  of the net cash  proceeds  of its  offering  of $225  million in
aggregate  principal  amount of its 9 1/4%  Senior  Notes due 2009 (the  "Senior
Notes"),  completed in May 1999. To the extent not used in the  Repurchase,  any
net proceeds from the Senior Notes are expected to be used for general corporate
purposes.  The Senior  Notes have a ten year term,  are  senior,  unsubordinated
securities of the Company and have covenants  substantially  similar to those in
the  outstanding  senior   subordinated  notes  of  the  Company's   subsidiary,
Safety-Kleen  Services,  Inc. Interest on the Senior Notes is payable in cash at
the rate of 9 1/4% per annum.

         The net proceeds of the Senior  Notes are being held in escrow  pending
completion of the Repurchase. The Company is required to redeem the Senior Notes
for 101% of the principal  amount plus accrued and unpaid  interest,  if any, to
the date of redemption if the Stockholders do not approve the Repurchase and the
other closing conditions in the Securities  Purchase Agreement are not satisfied
or waived (collectively,  the "Funding Conditions") by September 30, 1999. Funds
so held in escrow  pending  completion  of the  Repurchase  are invested in cash
equivalents and U.S. government obligations.



PURPOSES AND EFFECTS OF THE REPURCHASE


         If the  Proposal is approved,  Repurchase  will be effected and the PIK
Debenture  will, upon closing of the  Repurchase,  cease to be outstanding.  The
Company has negotiated the Repurchase with Laidlaw for the following reasons:

         (i) To reduce the Company's  consolidated  indebtedness and to increase
         consolidated  stockholders'  equity.  The  Company  has raised the cash
         portion of the purchase price of the PIK Debenture through its offering
         of Senior  Notes and will  finance  the balance of the  purchase  price
         through the issuance of the Shares.  As a result,  the Repurchase  will
         reduce  the  Company's  consolidated  net  debt by  approximately  $150
         million  and  increase  consolidated  stockholders'  equity by the same
         amount.  If the Repurchase  had occurred on May 31, 1999,  consolidated
         total  indebtedness  (long  term  debt  and the PIK  Debenture)  of the
         Company   would  have  been   reduced  from  from   $2,336,668,000   to
         $2,211,668,000  and consolidated  stockholders'  equity would have been
         increased from $1,111,338,000 to $1,261,338,000.



<PAGE>



         (ii) To simplify its capital structure  through  elimination of the PIK
         Debenture.  The PIK  Debenture  has added  complexity  to the Company's
         capital  structure and, the Company  believes,  caused confusion in the
         investment community.  Replacement of the PIK Debenture with the Senior
         Notes  and  Common   Stock  will   provide  the  Company  with  a  more
         conventional   capital   structure  which  will  assist   investors  in
         evaluating the Company's financial performance.


         (iii) To eliminate  the potential  for dilution  resulting  from future
         issuances  and  sales of Common  Stock  upon  payment  of  interest  or
         conversion  of the PIK  Debenture.  While the effect,  if any, that any
         such future  issuances  and sales of shares would have on market prices
         for the  Common  Stock is  uncertain,  the  Company  believes  that the
         perception  that such  issuances  and sales could  occur has  adversely
         affected the prevailing market price for the Common Stock.


         (iv) To eliminate the current  dilutive  impact of the PIK Debenture on
         basic  earnings per share.  For example,  for the nine months ended May
         31, 1999, the Company's  diluted  earnings per share were 12% below its
         basic earnings per share.  After the  Repurchase,  the Company  expects
         basic and diluted earnings per share to be comparable.

         The  Repurchase  will  also  reduce   Laidlaw's  fully  diluted  equity
ownership of the Company. Assuming conversion by Laidlaw of the PIK Debenture in
accordance  with its terms,  Laidlaw would own,  directly or indirectly  through
affiliates,  approximately 54.9 million shares of Common Stock, or approximately
49.2% of the then outstanding Common Stock.  Following closing of the Repurchase
and the issuance of the Shares as described above, Laidlaw will own, directly or
indirectly  through  affiliates,  approximately  43.9  million  shares of Common
Stock,  or  approximately  43.59%  of the then  outstanding  Common  Stock.  See
"Principal Stockholders and Management Ownership -- Principal Stockholder." (The
total  number of shares of Common  Stock owned by Laidlaw  upon  issuance of the
Shares is based upon the assumption that the Shares include  415,525  additional
shares of Common Stock  issued in payment of accrued and unpaid  interest on the
PIK Debenture through the date of the Repurchase in accordance with the terms of
the PIK Debenture as described  under the caption "Terms of the PIK  Debenture."
This  assumption  is based upon an assumed  August 27, 1999 closing date for the
Repurchase and upon an average price per share of Common Stock of $12.00.


         Finally,  the Company  believes the Repurchase could have the following
additional effects on its financial position:


         (i)  Increasing  the  consolidated  indebtedness,  as  defined  by  the
         Company's debt instruments.  The Repurchase will have the effect on the
         Company's  financial position of


<PAGE>



         increasing  the  Company's  consolidated  indebtedness  because the PIK
         Debenture is excluded  from the  definition of  indebtedness  under the
         Company's bank credit agreement, while the Senior Notes are included in
         such  definition.  As a  consequence  of this increase and the existing
         covenants in those debt  instruments,  the  Company's  operational  and
         strategic  flexibility  may be reduced.  For  example,  the Company may
         experience  reduced  availability  of debt to finance  possible  future
         transactions.

         (ii)  Increasing  interest  expense  required  to be paid in cash.  The
         Company is required to settle the semi-annual  interest payments on the
         PIK  Debenture by the issuance of Common Stock  through  April 8, 2000.
         After April 8, 2000, the Company could settle interest  payments on the
         PIK Debenture in either cash or Common Stock at is sole discretion. The
         Senior Notes require cash  interest  payments at the rate of 9 1/4% per
         annum.


         (iii)  Diluting  earnings per share on a basic  basis.  The issuance of
         additional  shares will reduce the Company's  basic earnings per share.
         However, the Company expects such reduction to be less significant than
         the dilutive impact of the PIK Debenture. The Company believes that the
         investment  community  historically  evaluated the Company based on its
         diluted earnings per share, among other criteria.
<PAGE>


         (iv) The  incurrence  of a $15  million  extraordinary  loss due to the
         write-off  of a deferred  tax asset which will no longer be  realizable
         due to the Repurchase.


         The terms of the  Repurchase  were  negotiated  between the Company and
Laidlaw during March and April 1999. The relative values ascribed by the Company
to the PIK Debenture and the Shares were based on the then quoted market prices,
where  available,  along with present value  calculations  calculated using then
current values and rates for similar securities and other customary  comparative
factors.


         If the Stockholders do not approve the Proposal, the Company expects to
consider other financing alternatives for the Repurchase.  Such alternatives may
include debt financings in addition to the Senior Notes or equity  financings on
terms  less  favorable  to the  Company  than  those  described  in  this  Proxy
Statement.

         If the Funding  Conditions are not satisfied by September 30, 1999, the
Company  will be required to redeem the Senior  Notes for 101% of the  principal
amount plus accrued and unpaid interest, if any, to the date of redemption. As a
result of fees paid and expenses incurred in connection with the offering of the
Senior Notes and the receipt of bank consents for the  Repurchase,  and interest
and premium  payable on the Senior  Notes,  if the Company is required to redeem
the Senior Notes the Company estimates that it will incur interest costs, net of
tax, of $2.0 million and an extraordinary loss, net of tax, of $8.0 million.

         Stockholders are advised to read the financial and other information of
the Company incorporated by reference into this Proxy Statement.


TERMS OF THE PIK DEBENTURE

         In connection with the Acquisition,  the Company issued a PIK Debenture
to LTI in the original  principal amount of  $350,000,000.  The principal of the
PIK  Debenture  is payable on May 15,  2009,  subject  to earlier  mandatory  or
optional prepayment and any acceleration of its maturity date upon default.  The
PIK Debenture  bears interest at the fixed rate of 5% per annum.  Until April 8,
2000, interest on the outstanding principal balance of the PIK Debenture accrues
at the 5% rate, but is only payable in shares of Common Stock.  After such date,
at the election of the Company,  payments due on the PIK Debenture  (except upon
an optional early redemption),  including any accrued interest or principal, may
be made in shares of Common Stock or cash.  The number of shares of Common Stock
for each such  payment  is  calculated  based on the  dollar  amount of  accrued
interest or principal due divided by the average of the daily closing  prices of
a share of  Common  Stock on the New York  Stock  Exchange  for ten  consecutive
trading days  selected by the Company  commencing  not more than 20 trading days
before, and ending not later than, the date such payment is due. Interest on the
outstanding  principal  balance of the PIK Debenture is payable  semiannually on
November 15 and May 15,  beginning on November 15, 1997 and continuing until the
payment in full of the PIK Debenture.

<PAGE>

         Beginning on May 15, 2002, and continuing  until the business day prior
to the  repayment of the PIK  Debenture,  the PIK Debenture is  convertible,  in
whole or in part, at the option of the holder, into shares of Common Stock, at a
price  equal to the  conversion  price  (the  "Conversion  Price") of $15.00 per
share, subject to anti-dilution adjustments.

         During the period  commencing  on May 15, 2002,  and  continuing  until
maturity, the Company has the option to prepay the PIK Debenture, in whole or in
part,  in cash,  at the face amount of the PIK  Debenture  if the last  reported
sales  price of a share of  Common  Stock,  as  reported  by the New York  Stock
Exchange,  equals or  exceeds  120% of the  Conversion  Price for a period of at
least  ten  consecutive  trading  days  prior  to  the  date  of  such  proposed
prepayment.

         Subject  to the  subordination  provisions  of the PIK  Debenture,  the
maturity of the PIK Debenture may be accelerated in the event a default  occurs,
with defaults including:

         (i) failure by the Company to pay the principal or accrued interest,

         (ii) the  voluntary or  involuntary  bankruptcy of the Company or other
         insolvency proceedings involving the Company, and

         (iii) the acceleration of the maturity of amounts outstanding under the
         Company's principal credit facility as a result of a default under such
         facility.

         The  PIK  Debenture  ranks  junior  in  right  of  payment  to  amounts
outstanding  under the Company's  principal credit facility and to substantially
all other  indebtedness of the Company except amounts owed (other than to banks,
insurance  companies and other  financing  institutions  and  obligations  under
capitalized  leases) for goods,  materials,  services or operating  lease rental
payments in the ordinary course of business or for compensation to employees and
any liability for federal, state, provincial, local or other taxes owed or owing
by the Company.

RECOMMENDATION OF THE BOARD

         The Board has determined that the approval of the Proposal is advisable
and in the best interests of the Company and the Stockholders,  has approved the
Proposal and recommends to the Stockholders  that you vote "FOR" approval of the
Proposal.


         Messrs. Bullock and Haworth, members of the Board who are also officers
of Laidlaw, did not participate in the Board vote with respect to the Repurchase
or the Proposal.  Mr. John Grainger,  also an officer of Laidlaw,  resigned from
the  Board  on  March  30,  1999,  prior  to the  Board's  consideration  of the
Repurchase and the Proposal.  All of the other Board members,  Messrs.  Rollins,
Sr., Rollins, Jr., Tippie,  Winger,  Thomas, Jr., Wrenn, Wareham and Luba, voted
to approve the Repurchase and the Proposal.



<PAGE>



                              PRINCIPAL ACCOUNTANTS

         The Company expects that representatives of PricewaterhouseCoopers LLP,
independent public accountants for the Company, will attend the Special Meeting,
will have the  opportunity  to make a statement if they desire to do so and will
be available to respond to appropriate questions.





<PAGE>


                PROPOSALS FOR 1999 ANNUAL MEETING OF STOCKHOLDERS

         Stockholders who intend to present  proposals for  consideration at the
Company's  1999  Annual  Meeting  are  advised  that any such  proposal  must be
received by the  Secretary of the Company no later than the close of business on
June 29, 1999, if such  proposal is to be considered  for inclusion in the proxy
statement and form of proxy relating to that meeting.

         If any Stockholder's  proposal is received after September 12, 1999 the
Company's  proxies  for the  1999  Annual  Meeting  may  exercise  discretionary
authority with respect to such proposal at the 1999 Annual  Meeting  without any
reference to such proposal being made in the proxy statement for such meeting.

                                 OTHER BUSINESS

         The Board is not aware of any other matter which will be presented  for
action at the Special  Meeting,  but if any other  business is properly  brought
before the Special  Meeting,  it is intended that the proxies received from this
solicitation will be voted by the persons named in the attached form of proxy in
accordance with their best judgment.

                              AVAILABLE INFORMATION


         The  Company  is  subject  to  the  informational  requirements  of the
Securities  Exchange Act of 1934,  and in accordance  therewith  files  reports,
proxy  statements  and  other  information  with  the  Securities  and  Exchange
Commission  (the  "Commission").  Copies of such reports,  proxy  statements and
other  information  filed with the Commission may be inspected and copied at the
public reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street,  N.W.,  Judiciary  Plaza,  Washington,  D.C.  20549 and at the following
Regional Offices of the Commission:  7 World Trade Center, Suite 1300, New York,
New York  10048 and  Citicorp  Center,  500 West  Madison  Street,  Suite  1400,
Chicago, Illinois 60661-2511.  Copies of such material may also be obtained from
the  Public  Reference  Section of the  Commission  at 450 Fifth  Street,  N.W.,
Judiciary  Plaza,  Washington,  D.C. 20549 at prescribed  rates.  The public may
obtain  information on the operation of the Public Reference Room by calling the
Commission at 1-800-SEC-0330.  The Company files information electronically with
the Commission. The Commission maintains an Internet site that contains reports,
proxy and information  statements and other  information  regarding issuers that
file  electronically  with  the  Commission.  The  address  of the  Commission's
Internet  site is  http://www.sec.gov.  The Common Stock is listed and traded on
the New York Stock  Exchange.  The Common  Stock is also  traded on the  Pacific
Exchange,  Inc.  Reports,  proxy statements and other  information  filed by the
Company  with the  Commission  may be  inspected  at the offices of the New York
Stock Exchange, 20 Broad Street, New York, New York 10005, and at the offices of
the Pacific Exchange, Inc. at 301 Pine Street, San Francisco, California 94104.




<PAGE>



                           INCORPORATION BY REFERENCE

         The  following  documents  filed  with the  Commission  by the  Company
pursuant  to the  Exchange  Act are  incorporated  by  reference  in this  Proxy
Statement:

       1. The  Company's  Annual  Report on Form 10-K for the fiscal  year ended
       August 31, 1998;

       2. The  Company's  Quarterly  Report on Form 10-Q for the fiscal  quarter
       ended November 30, 1998;

       3. The  Company's  Quarterly  Report on Form 10-Q for the fiscal  quarter
       ended February 28, 1999;

       4. The  Company's  Quarterly  Report on Form 10-Q for the fiscal  quarter
       ended May 31, 1999;

       5. The Company's Current Reports on Form 8-K dated April 20, 1999, May 5,
       1999, May 10, 1999, May 17, 1999 and May 27, 1999;

       6. The Audited Financial  Statements for the three years ended January 3,
       1998 and the Unaudited Interim Financial  Statements for the period ended
       March  28,  1998  of  Safety-Kleen   Systems,  Inc.  (formerly  known  as
       Safety-Kleen Corp.) filed in Safety-Kleen  Services,  Inc.'s Registration
       Statement on Form S-4 (No. 333-57587) filed on October 23, 1998.

         All  documents  subsequently  filed by the Company  pursuant to Section
13(a),  13(c),  14 or 15(d) of the Exchange Act  subsequent  to the date of this
Proxy  Statement and prior to the date of the Special Meeting shall be deemed to
be  incorporated  by reference into this Proxy  Statement and to be part of this
Proxy  Statement  from the date of filing  of such  documents.  All  information
appearing  in  this  Proxy  Statement  is  qualified  in  its  entirety  by  the
information and financial statements  (including the notes thereto) appearing in
the documents incorporated by reference into this Proxy Statement. Any statement
contained in a document  incorporated  or deemed to be incorporated by reference
into this Proxy Statement shall be modified or superseded,  for purposes of this
Proxy  Statement,  to the  extent  that a  statement  contained  in  this  Proxy
Statement  or  in  any  subsequently   filed  document  that  is  deemed  to  be
incorporated  into  this  Proxy  Statement   modifies  or  supersedes  any  such
statement.  Any statement so modified or superseded shall not be deemed,  except
as so modified or superseded, to constitute a part of this Proxy Statement.


            CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS


         Certain statements  contained in this Proxy Statement  (particularly in
"The  Proposal"),  any statements  preceded by,  followed by or  incorporated by
reference into or that include the words "believes," "expects," "anticipates" or
similar expressions, and other statements contained or incorporated by reference
herein  regarding  matters that are not historical  facts, are or may constitute
forward-looking  statements  (as such term is defined in the Private  Securities
Litigation Reform Act of 1995). Because such statements are subject to risks and
uncertainties,  actual



<PAGE>



results  may  differ   materially  from  those  expressed  or  implied  by  such
forward-looking  statements.  The risks and uncertainties  that may cause actual
results to differ include,  among others,  general  economic  conditions,  risks
associated  with  acquisitions,  fluctuations  in operating  results  because of
acquisitions  and  variations  in stock prices,  changes in applicable  federal,
state and local  laws and  regulations,  especially  environmental  regulations,
alternate  and  emerging   technologies,   competition  and  pricing  pressures,
overcapacity   in  the   industry,   seasonal   fluctuations   due  to  weather,
uncertainties of litigation, and risks associated with the operation, growth and
integration of newly  acquired  businesses.  As a result of these  factors,  the
expected effects of the Repurchase could vary from those described in this Proxy
Statement,  the  Company's  revenue  and income  could vary  significantly  from
quarter to quarter,  and past financial  performance  should not be considered a
reliable  indicator of future  performance.  Stockholders  are  cautioned not to
place undue reliance on such statements, which speak only as of the date hereof.
The Company  undertakes no obligation to release publicly any revisions to these
forward-looking  statements to reflect  events or  circumstances  after the date
hereof or to reflect the occurrence of unanticipated events.


<PAGE>

                                                                      APPENDIX A



                               SAFETY-KLEEN CORP.


         This proxy is  solicited  by and on behalf of the Board of Directors of
Safety-Kleen  Corp. (the "Company").  The undersigned hereby appoints Kenneth W.
Winger,  Paul R.  Humphreys and Henry H. Taylor or any of them,  the attorney or
attorneys  and  proxy  or  proxies  of  the  undersigned   with  full  power  of
substitution  to attend the Special Meeting of Stockholders of the Company to be
held at 1301 Gervais Street,  Suite 300 Columbia,  South Carolina,  at 9:00 a.m.
local time, on Friday,  August 27, 1999, and at any  postponement or adjournment
thereof,  to vote all shares of common  stock,  $1.00 par value,  of the Company
(the  "Common  Stock")  that the  undersigned  shall be entitled  to vote.  Said
proxies are  instructed to vote on the matters set forth in the proxy  statement
as specified on the reverse.

         The  Board of  Directors  recommends  a vote  "FOR" the  proposal  (the
"Proposal") to approve the issuance of shares (the "Shares") of Common Stock, to
Laidlaw  International  Finance  Corporation  ("LIFC") or another  affiliate  of
Laidlaw  Inc.,  in  connection  with  the  Company's  proposed  repurchase  (the
"Repurchase")  of its  outstanding  $350  million  5%  Subordinated  Convertible
Pay-In-Kind  Debenture due 2009 (the "PIK  Debenture")  held by LIFC. The Shares
include 11,320,755 shares of Common Stock plus an additional number of shares of
Common  Stock in payment  of accrued  and  unpaid  interest  on the  outstanding
principal balance of the PIK Debenture to the date of the Repurchase.


         This proxy when  properly  signed and dated will be voted in the manner
directed  herein by the undersigned  stockholder.  IF NO DIRECTION IS MADE, THIS
PROXY WILL BE VOTED "FOR" THE PROPOSAL.


               --------------------------------------------------------

                              FOLD AND DETACH HERE

                             [this is reverse side]

[ X ] Please mark your votes as in this example.


                                           FOR        AGAINST       ABSTAIN

1.  Approval of the Proposal:              [  ]        [  ]           [  ]


2. In their  discretion,  the  proxies  are  authorized  to vote upon such other
business as may properly come before the meeting.

Please sign exactly as name  appears to the left.  When shares are held by joint
tenants,  both should sign. When signing as attorney,  executor,  administrator,
trustee or guardian,  please give full title.

<PAGE>

If a corporation,  please sign in
full corporate name by authorized officer. If a partnership, sign in partnership
name by authorized person. If more than one trustee, all should sign. This proxy
may be revoked any time prior to its exercise.

____________________________________(L.S.)

____________________________________(L.S.)
SIGNATURE(S)               DATE:

                     PLEASE SIGN, DATE AND RETURN THIS PROXY

         PROMPTLY---------------------------------------------------------------
                              FOLD AND DETACH HERE





<PAGE>


                               SAFETY-KLEEN CORP.

Dear Stockholder:

         We encourage you to take  advantage of two new and  convenient  ways by
which you can grant a proxy to vote your  shares.  You can grant a proxy to vote
your shares  electronically  by telephone or via the Internet,  which eliminates
the need to return the proxy card.


         By Telephone: To grant a proxy to vote your shares by telephone,  use a
touch-tone telephone and call the following toll-free number: 1-877-PRX-VOTE, 24
hours a day, 7 days a week.  Insert the Control Number printed in the box above,
just below the perforation. Follow the simple recorded instructions.

         By Internet:  To grant a proxy to vote your shares via the Internet, go
to website  www.eproxyvote.com/SK.  Insert the Control Number printed in the box
above,  just below the  perforation  and then  follow  the simple  instructions.
Please be aware that if you grant a proxy to vote your shares over the Internet,
you may incur costs such as  telecommunication  and Internet  access charges for
which you will be responsible.

         The Internet and telephone  facilities will be available until midnight
on August 26, 1999 the day before the Special Meeting.


      Do Not Return Proxy If You Are Submitting Your Proxy By Telephone or
      --------------------------------------------------------------------
      The Internet
      ------------




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