aluminum wheel cleaning

My son recently bought a car with original brushed/textured aluminum wheels. They have stains that regular washing and scrubbing won't penetrate.
Any products or ideas on how to make them look better? Thanks!

You could go to a truck stop or something and get some Oatar or Jeweler's Rouge, that stuff will take anything off. You'll need a grinder to apply the Rouge though. We cut the fuel tanks on the semis with grinders and the Rouge, and it works very nice.

Thanx for the advice. He'll give it a shot. Oz