aluminum wheel cleaning

My son recently bought a Camaro 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!

not necessary to post 3 duplicate threads...

ec437, hi. I didn't realize I posted 3 duplicate threads since I posted them in different areas. If you didn't have anything productive to say in response to my question, sorry we both wasted our time.