Okay guys...this is something new. I had a door salesman sell me a bottle of this all natural citrus wonder cleaner the other day. It comes in a 1 quart bottle with a squirt bottle with markings for you to mix different proportions for different uses, and there is a whole long list of uses! It's quite expensive though, at $33 a bottle, but when you dilute it out for various uses, I guess it's not bad.
Anyway, it's not toxic, the guy ran the tube from the spray bottle thru' his tongue and licked the cleaner! The cleaner when used undiluted, removed oil stains on my garage floor with minimal scrubbing!
So, to cut a long story short, I tried it on my wheels with 1:5 ratio and the brake dust just ran off my wheels. Now, my wheels do not have stubborn old stains, so I don't know about those. Maybe a more concentrated mix will do with those. What I like is it's not toxic and the mist and overspray won't damage my paintjob, tire, etc. And not to mention the wheel cleaner that often gets into my face and eyes when it's windy outside! This citrus cleaner, I can breathe easy and I don't have to worry about letting it stay too long on the wheels.
Check it out for yourself:
http://www.advanage.com