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It was a grubby business: helping auto-repair shops clean oily tools and parts. Still, Donald Brinckman saw potential.In 1968, he was looking for new products that could be sold by the Chicago maker of automotive parts where he worked as a vice president. He visited a tiny Milwaukee company making a parts-washing machine consisting of a red washtub mounted atop a barrel filled with solvent.Mr. Brinckman envisioned a nationwide business. His employer agreed to pay about $185,000 for the firm, Safety-Kleen Corp. As CEO of Safety-Kleen, Mr. Brinckman turned it into an international company that recorded profit increases of at least 20% annually for 18 consecutive years in the 1970s and 1980s and became a Wall Street darling.

