Leading Independent Proxy Advisory Firms ISS and Glass Lewis Recommend Heritage-Crystal Clean Shareholders Vote “FOR” the All-Cash Transaction with J.F. Lehman & Company - Seite 3

Forward-Looking Statements

This communication contains forward-looking statements. Forward-looking statements include, without limitation, projections, predictions, expectations, or beliefs about future events or results and are not statements of historical fact. Such statements may include statements regarding the completion of the proposed merger and the expected timing of the completion of the proposed merger, the management of Crystal Clean upon completion of the proposed merger and Crystal Clean’s plans upon completion of the proposed merger. Such forward-looking statements are based on various assumptions as of the time they are made, and are inherently subject to known and unknown risks, uncertainties and other factors that may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Forward-looking statements are often accompanied by words that convey projected future events or outcomes such as “expect,” “believe,” “estimate,” “plan,” “project,” “anticipate,” “intend,” “will,” “may,” “view,” “opportunity,” “potential,” or words of similar meaning or other statements concerning opinions or judgment of Crystal Clean or its management about future events. There can be no assurance that actual results, performance, or achievements of Crystal Clean will not differ materially from any projected future results, performance or achievements expressed or implied by such forward-looking statements. Actual future results, performance or achievements may differ materially from historical results or those anticipated depending on a variety of factors, some of which are beyond the control of Crystal Clean, including, but not limited to: the occurrence of any event, change or other circumstances that could give rise to the termination of the Merger Agreement; the inability to complete the proposed merger due to the failure to obtain stockholder approval for the proposed merger or the failure to satisfy other conditions to completion of the proposed merger; risks related to disruption of management’s attention from Crystal Clean’s ongoing business operations due to the proposed merger; unexpected costs, charges or expenses resulting from the proposed merger; Crystal Clean’s ability to retain and hire key personnel in light of the proposed merger; certain restrictions during the pendency of the proposed merger that may impact Crystal Clean’s ability to pursue certain business opportunities or strategic transactions; the ability of the buyer to obtain the necessary financing arrangements set forth in the commitment letters received in connection with the proposed merger; potential litigation relating to the proposed merger that could be instituted against the parties to the Merger Agreement or their respective directors, managers or officers, including the effects of any outcomes related thereto; the effect of the announcement of the proposed merger on Crystal Clean’s relationships with its customers, operating results and business generally; and the risk that the proposed merger will not be consummated in a timely manner, if at all. Crystal Clean refers you to the “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” sections of Crystal Clean’s Form 10-K for the fiscal year ended December 31, 2022, and comparable sections of Crystal Clean’s Quarterly Reports on Form 10-Q and other filings, which have been filed with the SEC and are available on the SEC’s website at www.sec.gov. All of the forward-looking statements made in this Current Report on Form 8-K are expressly qualified by the cautionary statements contained or referred to herein. The actual results or developments anticipated may not be realized or, even if substantially realized, they may not have the expected consequences to or effects on Crystal Clean or its business or operations. Readers are cautioned not to rely on the forward-looking statements contained in this Current Report on Form 8-K. Forward-looking statements speak only as of the date they are made and Crystal Clean does not undertake any obligation to update, revise or clarify these forward-looking statements, whether as a result of new information, future events or otherwise.