i bought the wheel cleaner from my dealer for lil over $7 for the bottle. it seems to do an ok job, with just spraying the wheel w/ water, then squirt the solution, wait 15, 20 secs then rince off.
i only had one application, but next time i clean, i'll actually be using a sponge to wipe off the brake dust while the soultion is applied, then rinse off. better suggestions would be appreciated here also ^^