I had read many threads on many forums about taking care of Vinyl Stripes. I finally bought some 303 and tried it out...just to post as disappointed - and find out the best results are on flat black! On my new to me GWE SRT8, that would not remove spots or scuffs at all - glossy black! I accidentally was working on rubbing out some scuffs on the rear bumper, and rubbed over the black decal stripes with med rubbing compound. I could see that it was dulling the stripe. But, it was also removing some pretty good scuffs. So, I finished off with 3M "Perfect-It", and then Turtle Wax ICE! (Rub parallel to decal edges) And the stripes turned out beautiful! WOW! Here's a few pictures as proof! Before...spots and scuffs. And after!