use caustic soda it works ace i have got a hog that was black now its silver (i didnt take my wheel apart to do it i just poured it on and it didnt take the black off the spokes) and u can get it from b&q
my mate craig has got a gu mod and he runs a echo booster kool stops and a harsh grind works ace ive got a 05 python with a czar booster zoo pads and a try all rim with a non grind its mint (Y)no slips even in the rain