I have a problem. The cladding on my front-left fender is turning brown. I'm guessing the hot sun is drying it out and making it discolor. It's not on the entire cladding, just on the upper part where the actual body meets the cladding, on that little strip. I'm noticing that it's starting to happen to my other fender claddings also. Would Back to Black help get rid of the discoloration? Your thoughts...