My truck wheels are aluminum and I used something called "black magic" and it said it was a non scrub cleaner. It did get surface dirt but I used a scrubber and there is more on my wheels than dirt. There is unknown material above the surface of the wheel.
I scrubbed extensively with black magic and it is not getting the stuff off.
Sand paper of course would get it off but it would ruin the surface.
I saw a couple webpages on Google and How To, but none even had a scrubber just a solution and a rag. That won't get these wheels clean.