I used the Hot Wheels wheel cleaner for about a year and it peeled the clear coat off my red Boxster S calipers...
Never again.
One thing I did do was take off the wheels and clean off all the brake dust from the rim and back of the spokes with a power washer and then applied 3 or 4 coats of Armor All Wheel Protectant. It did make the brake dust easier to remove....
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2002 Boxster S, Arctic Silver, 18" Turbo Wheels, 6-speed
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