My rear moldings look like hell. From a distance you can't tell, but up close they look bad. I once heard this guy list a technique he used to clean them up. He started off with some medium grit sandpaper and gradually worked them with finer and finer paper till they were smooth again and repainted them. I haven't tried it yet. The only other way I know is to buy a new rear quarter window since they come with a new molding.