Originally Posted by YzGyz

Nothing. If the surface is not clean, laying a towel or whatever on it still has the potential to scratch. When you lean on the towel, the towel moves, moving towel will flash the dirt and scratch the paint. Who washes there car before there wrench? I know I don't. I just make sure not wear clothes with zippers, buttons, ECT that can do some major scratching.

YzGyz