When crews at Lakeside Painting Inc. head for an industrial plant to do tough paint-preparation cleaning, they go armed with bags of sponge pellets. Sounds like a joke waiting for a punch line, right?Even Joe Pangburn, the president and owner of the company based in East Troy in southeastern Wisconsin, admits he was a bit doubtful at first when he heard about this unusual cleaning system made by Sponge-Jet Inc. But he was totally sold once he saw the system make short work of a particularly grimy cleaning project inside a Milwaukee factory.“Sure, I was skeptical,” admits Pangburn, who bought
