Scrub Daddy: Aaron Krause. How a Failed Experiment Became a Billion-Dollar Sponge

Aaron Krause did not set out to reinvent the kitchen sponge. He was a car detailer, building buffing pads and the machines that made them. To clean his greasy hands, he made a makeshift hand scrubber out of extra-rough foam, and it worked so well he decided to sell it. But nobody wanted it.