It is between alloy and the lacquer.Anyone know the best way to clean off the hard white oxidation from alloy wheels? Can i scrub it with sandpaper? Soap and water doesn't work.
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You can’t clean it off. You need to send the wheel to a specialist as the face needs to be re cut on a specialist machine with a diamond cutting tool.
If you really insist on doing it yourself then most people paint the whole wheel one colour