Sonax Full Effect Wheel Cleaner
I'm different than a lot of M3 owners on this forum; I hate--HATE--washing my car. I like a clean car but hate the hassle and waste of time that car washing is to me. So I was regretting having to wash the car after waiting for so long--6 months or so. I was especially flinching about washing the wheels, with that nuclear waste BMW brake pad material.
After researching cleaners, I settled on Sonax Full Effect. Without getting too detailed, the stuff is AMAZING! There is no wheel cleaner I have found that just works with a rinse; you have to use a sponge or brush and soap after the cleaner rinse. But the Sonax did such a good job of turning the baked on brake dust into something that easily sponged off I couldn't believe it. It was well worth the money.
So, if you're lazy like me and want an awesome wheel cleaner, look no further than this stuff.
I have no affiliation with Sonax other than being a lazy, satisfied user.