at the end of my side skirt where it kinda flares out, there is a bunch of hard gunk that won't come off. I've washed it frimly, but gently, and it won't come off.
TW = Turtle Wax. Yellow aerosal can. Cheap, easy to get, and very effective. I haven't tried the newest trigger spray type though, so don't know how effective it is. Stoner's Tarminator is the other one which is very popular on Autopia.