I had Acme clean all my concrete today and they did an amazing job. They sent out two guys who pre-treated the really bad spots (oil, paint, hard water stains, nameless gunk) and then proceeded to wash away 10 years worth of built up grunge. The previous homeowner spilled paint in the garage and then let his two year old walk through it and track it all around the garage -- GONE. Hard water stains on my patio from a flower pot -- GONE. Paint drops/globs and other nameless gunk all over the place -- GONE. A huge oil stain in my garage from a loose oil filter on my wife's car -- GONE. I spent an hour one day scrubbing that oil stain with something from Costco but it barely made a dent in it. These guys made it look easy, they definitely have the right tools for the job. There are still a few rust spots, but they are definitely lighter and overall I am extremely happy, it was well worth the price. I honestly didn't expect them to get out as much as they did. Highly Recommended! Thanks!