I've been using Megs Ultimate All Wheel Cleaner on mine - maybe every 3rd or 4th wash (just soap/water for the other washes). Cheap, works well, doesn't smell miserable.
I used Sonax Full Effect at first but couldn't stand the smell (which stuck with the car and in my garage for days even after double and triple rinsing); plus it seemed to still require lots of scrubbing to get all the brake dust off. I didn't even finish the bottle it was that bad.
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