I have a yellow stang with a white top, and i've been trying to figure out for MONTHS how to clean the mildew off of it. I have talked to a guy at a top shop, other vert owners, finally I posted to a professional deatiling forum. They told me to get some stuff called "Amazing Roll Off" from a boat supply store. Wet the top down, spray it on, let it soak about 5 minutes, scrub with a nylon brush (like a bathtub cleaning brush) and then rinse it off very well, but you just have to make sure that you use LOTS of water to dilute it enough not to hurt your clearcoat. IT LOOKS BRAND NEW!!!!! I HIGHLY reccomend this to ANYBODY looking to clean their top!!!