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Get some Mothers PowerMetal Aluminum Polish, put some on the ball and then go to work on the wheels. Work in small sections and when the polish turns blackish, wipe it off with a clean rag.
it's going to take a while. i don't miss my weld wheels because of that. the ball isn't going to get into the tight spaces and it flings polish all over. 'never dull' wadding works well too.