We have Winn MH, the style with decals (not full body paint - I wish...) No matter what I try to use to clean I can't get grey grunge to clean away from white fiberglass areas, it's like it is unde...
If it's the sun side, look closely, you're probably seeing the fibers of the fiberglass. After many years of being hit by the sun, the fiberglass is just not repairable. If you've tried many products already, yo will not improve the look. The best you can do is to keep it waxed and shiny. The color won't come back.