I just stripped 27 year old clearcoat off my car's machined aluminum rims. There isnt any pitting, but there are a lot of white marks (aluminum oxide?) and some dark spots. I sprayed and scrubbed with aluminum wheel cleaner. Rubbing compound and aluminum polish (both by hand) havent removed the imperfections. I dotn want to sand the rim because I like the original machined look (many times circular lines). I do get a lot of black soot off when I polish. Any suggestions? Thanks!