Philip Foglar said:Well I reckon anti-static would help prevent brake dust from being attracted to the surface. Also something that gives a good water barrier is good, so a good wax treatment should sort this out. Another trick is to always properly dry off your cleaned wheels - this by itself helps reduce brake dust build-up...
Philip, I've got a bucket sponge and chamois just for my wheels. Left the wheels for 4 days now and looks terrible.