Wolfgang Concours Series WG-4300 Glass Polish, 16 fl. oz. Wolfgang Perfect Vision Glass Polish is a citrus-based chemical cleaner. Infused with a blend of glass-safe abrasives designed to gently remove water spots, road film, and other common contaminants that are often found on the windshield of a daily driver. The specially-milled abrasives remove the offending contaminants without scratching glass. Apply by hand with a terrycloth applicator or by machine with a soft foam polishing pad.