Sonax Full effect wheel cleaner. Use it on my 1er, used it on my uncle's dirty dirty wheels on a M3.
I used to use mother's but it doesn't hold a match to Sonax
2012 BMW 128i 6MT Deep Sea Blue Metallic
FX-R Bi-Xenon Projectors With 5000k Bulbs & Halo's More Kick Ass Than Any BMW