I have to give praise to Rejex as an excellent wheel protectant. I have applied it to both my sets of wheels. One I use for the street, stock style 135, and my 17" track wheels.
I had a track day on 4/9 which produced a pretty good cake of track pad dust on my Kosei's. I continued to drive on them until this past weekend, 11 days more of dust build up. They were pretty much black, front and back. I hosed them off, used warm water with my usual Meguire's Gold Class soap, and a small kitchen sponge. The dust just wiped right off. Not one stain, not one spec of dust remained. They look brand new!
I'm probably going to apply Rejex to my front bumper and paint below the waist-line during my next full detail. It's really good stuff to stand up to the abuse of track duty!