The wife parked her black Excursion in a parking lot next to a sprinkler. This sprinkler did a number on the paint, as well as the Glass. (most of the pass side). I used body clay on the paint, and thought I would try it on the glass. It worked like a charm. It needed quite a bit of spray lube (sold with the body clay). Letting this stuff dry out was a bad thing. It worked so well, I ended up doing the whole vehicle. I thought I took good care of the paint. A big difference was very noticeable. Btw Steel wool is ok for glass and chrome. Scotch brite should never be used, it will do exactly what it is designed to do.......scuff (dull) the surface.