I've re-done 3 sets so far...1)Stripper 2)Sand the damaged areas and feather it out..I use a orbital sander and depending on how deep the damaged spots are I adjust my paper..finishing with a fine grit. 3) Polish the wheel..the sets I've done so far looked great polished out so I cleaned them...
I know the problem you're having..I have to deal with red clay stained tires..the best stuff Ive found is a cleaner called "555". It's made by a company here in Chattanooga and sold through a rep.
Snowdrifter...
On those rims I would peel the Plasti-Coat off and simply sand (scuff) with some 120 and some Scotch-Brite...clean with some denatured alcohol and shoot them with the matte...clear coat will give them some gloss.:dblthumb2: