last night me and the usual group of bmxicans went riding last night through boston, and they were telling me about how they used to use simple green to clean their back rim and brake pads. well i tried it last night, flipped the bike upside down, and pedaled it for a while, while spraying simple green on the back rim. then i just held a paper towel on it, you would be suprised how much black shit comes off the rim. after doing both sides, i wiped off the brake pads until they were clean green (i have the dekka fiesta pads). now when you touch the brakes, they lock up instantly, and squeak if theres any drag. its definitely worth the time it takes to clean.