SAFETY KLEEN CORP
DFRN14A, 1998-03-03
BUSINESS SERVICES, NEC
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                            SCHEDULE 14A INFORMATION
          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                              EXCHANGE ACT OF 1934
                             (AMENDMENT NO.      )
 
     Filed by the registrant [ ]
 
     Filed by a party other than the registrant [X]
 
     Check the appropriate box:
 
     [ ] Preliminary proxy statement        [ ] Confidential, for Use of the
                                                Commission Only (as permitted by
                                                Rule 14a-6(e)(2))
 
     [ ] Definitive proxy statement
 
     [X] Definitive additional materials
 
     [ ] Soliciting material pursuant to Rule 14a-11(c) or Rule 14a-12
 
                               SAFETY-KLEEN CORP.
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                (Name of Registrant as Specified in Its Charter)
 
                      LAIDLAW ENVIRONMENTAL SERVICES, INC.
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    (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 14a-6(a)(1) and
0-11.
 
     (1) Title of each class of securities to which transaction applies:
 
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     (2) Aggregate number of securities to which transaction applies:
 
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     (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):
 
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     (4) Proposed maximum aggregate value of transaction:
 
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     (5) Total fee paid:
 
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     [ ] Fee paid previously with preliminary materials.
 
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     [ ] 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:
 
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     (2) Form, schedule or registration statement no.:
 
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     (3) Filing party:
 
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     (4) Date filed:
 
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<PAGE>   2
 
(LAIDLAW ENVIRONMENTAL SERVICES INC. LETTERHEAD)
 
                               March 2, 1998
 
DEAR SAFETY-KLEEN
SHAREHOLDER:              We believe Safety-Kleen's Board has lost sight of one
                          simple issue: SHAREHOLDER VALUE.
 
                          In its relentless pursuit of a proposed $27.00 per
                          share merger with S-K Parent Corp. (the "Buyout
                          Merger") THE BOARD HAS CHOSEN TO REJECT THE OPINION OF
                          ITS OWN INVESTMENT BANKERS, to ignore the votes of
                          shareholders and to support what we believe to be an
                          inferior offer.
 
                          When you vote on the Buyout Merger on March 9,
                          consider the following.
 
LAIDLAW ENVIRONMENTAL'S
OFFER PROVIDES GREATER
VALUE, UPSIDE POTENTIAL
AND SYNERGIES             Laidlaw Environmental is offering $30(1) for each
                          share of Safety-Kleen.
                          The Laidlaw Environmental offer also allows
                          Safety-Kleen shareholders to participate in the value
                          that we believe will be created by combining two of
                          the leading service companies in the hazardous and
                          industrial waste management business.
 
                          The strategic merger of Safety-Kleen with Laidlaw
                          Environmental will combine the strengths of
                          Safety-Kleen's premier service delivery and recycling
                          system and its 400,000 small to medium sized customers
                          with Laidlaw Environmental's network of fully
                          permitted service centers and its 18,000 medium to
                          large customers. We believe this merger will generate
                          $100-$130 million of cost savings synergies that will
                          benefit ALL continuing Laidlaw Environmental
                          shareholders.

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FACT: SAFETY-KLEEN'S
OWN INVESTMENT BANKER
AND ISS SAY THE LAIDLAW
ENVIRONMENTAL OFFER IS
SUPERIOR                  "...it is our opinion as investment bankers that it is
                          more likely than not that, as of the time of the
                          anticipated closing of the Current LLE Offer, the
                          value of the consideration which would be received
                          under the Current LLE Offer would exceed the value of
                          the consideration which would be received in the
                          Merger."
 
                                    From letter dated January 31, 1998 from
                                    William Blair & Company, L.L.C. to the Board
                                    of Directors of Safety-Kleen Corp.
 
                          "On balance, we believe that [Laidlaw Environmental's]
                          offer is superior to the proposed Philip Group
                          merger.... Due to these factors, we believe that [the
                          Safety-Kleen] shareholders should not support this
                          merger agreement."
 
                                    From February 5, 1998 report of
                                    Institutional Shareholder Services, the
                                    leading independent proxy advisory firm.

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- ------------------------------------
(1) The Offer consists of $18 cash and $12 of Laidlaw Environmental Services
    Inc. Common Stock, assuming the fair market price of Laidlaw Environmental
    Common stock is not less than $4.28571. The actual fair market value of the
    Laidlaw Environmental Common Stock to be exchanged pursuant to the Laidlaw
    Environmental offer may vary, and will be less than $12.00 if the market
    price on the day of exchange is less than $4.28571.
<PAGE>   3
 
THE SAFETY-KLEEN BOARD
CONTINUES TO IGNORE THE
WISHES OF SHAREHOLDERS    
                          SAFETY-KLEEN SHAREHOLDERS SIMPLY HAVE NOT DEMONSTRATED
                          SUPPORT FOR THE BUYOUT MERGER. Although approximately
                          54% of the Safety-Kleen shareholders tendered into our
                          Offer as of February 13, 1998, we recognize that these
                          shareholders could also vote in favor of the Buyout
                          merger. However, Safety-Kleen has twice adjourned the
                          shareholder meeting at which the Buyout Merger is to
                          be considered -- from February 11 to February 25, and
                          from February 25 to March 9.
 
                          Based on information released by Safety-Kleen after
                          the February 5 adjournment, as of February 25 LESS
                          THAN 50%of the outstanding Safety-Kleen shares have
                          been voted in favor of the Buyout Merger.
 
                          When will the Board face the fact -- SHAREHOLDERS DO
                          NOT SUPPORT THE BUYOUT MERGER.
 
WE HAVE GONE TO COURT
TO SEEK RELIEF            Because less than one-half of Safety-Kleen's
                          shareholders supported the Buyout Merger proposal and
                          in light of Safety-Kleen's adjournment of the February
                          25 special meeting to March 9, Laidlaw Environmental
                          is seeking an injunction requiring the Safety-Kleen
                          Board to remove all remaining impediments to the
                          Laidlaw Environmental offer.
 
NOW YOU SHOULD TELL THE
BOARD TO STOP
STONEWALLING -- VOTE
AGAINST THE BUYOUT
MERGER                    Preserve your opportunity to participate in Laidlaw
                          Environmental's premium offer by voting AGAINST THE
                          BUYOUT MERGER PROPOSAL.
                          Laidlaw Environmental is committed to its offer. If
                          Safety-Kleen shareholders reject the Buyout Merger,
                          Laidlaw will not withdraw its offer until
                          Safety-Kleen's shareholders have had sufficient time
                          to accept the Laidlaw Environmental offer.
 
                          Let the Safety-Kleen board of directors know YOU WILL
                          NOT SETTLE FOR THE BUYOUT MERGER.
 
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                         VOTE AGAINST THE BUYOUT MERGER
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                           SIGN, DATE AND RETURN THE
                        GREEN-STRIPED PROXY CARD TODAY.
 
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    IF YOU NEED ASSISTANCE OR INFORMATION, PLEASE CALL OUR PROXY SOLICITOR:
                      MORROW & CO., INC. @ (800) 662-5200
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THIS SOLICITATION RELATES SOLELY TO THE SOLICITATION OF PROXIES WITH RESPECT TO
THE MARCH 9, 1998 MEETING AND IS NOT A REQUEST FOR THE TENDER OF SHARES OF
SAFETY-KLEEN COMMON STOCK. THE DETAILED TERMS AND CONDITIONS OF THE LAIDLAW
ENVIRONMENTAL OFFER ARE SET FORTH IN THE AMENDED PROSPECTUS OF LAIDLAW
ENVIRONMENTAL AND THE RELATED LETTER OF TRANSMITTAL WHICH HAVE BEEN SEPARATELY
MAILED TO SAFETY-KLEEN SHAREHOLDERS.


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