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

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

   
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                      [LETTERHEAD OF SAFETY-KLEEN CORP.]


FOR IMMEDIATE RELEASE                                      Contact: Maureen Fisk
                                                                    847/468-2452


                          SAFETY-KLEEN BOARD CONFIRMS
                   RECOMMENDATION OF SK PARENT CORP. MERGER

     March 9, 1998--Elgin, IL--Safety-Kleen Corp. today announced that its Board
of Directors met on Saturday, March 7 and unanimously confirmed their strong
recommendation that shareholders vote in favor of the $27 per share all cash
offer of SK Parent Corp. at today's special shareholders' meeting.

     In making its recommendation, the Board reviewed reports by management and 
others involved in soliciting votes for the SK Parent transaction and its 
continuing concerns regarding the uncertain value of Laidlaw Environmental's 
common stock, including the Board's belief that:

     . The greater certainty of $27 per share, all cash, is preferable to the 
       risks of continuing market fluctuation of LLE's stock.

     . Safety-Kleen's and LLE's businesses are basically incompatible and the
       synergies necessary to make LLE's transaction non-dilutive to LLE's
       earnings per share cannot be achieved without significantly reducing
       Safety-Kleen's service quality, revenue and profit.

     . The future growth of the combined businesses will be burdened by the need
       to service approximately $2.3 billion in debt.

     . The market will not be able to absorb the issuance of up to 162 million 
       additional shares by LLE without driving down its share price.

     The Board urges all shareholders to take the opportunity today to secure 
the $27 per share all cash merger proposal from SK Parent.

     Safety-Kleen is an environmental and industrial service company dedicated 
to helping nearly 400,000 industrial and automotive customers recycle and 
process their waste streams.


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