ok well ive tried searching and couldnt find squat.... whats the best way to remove this black smoke or carbon residue off the bumper with out harming anything, this is starting to get really annoying because this is a greddy sp catback thats doing this but id imagine it wouldnt matter what exhaust it is bein that its a white car. thanx guys

 

try using meguires cleaner wax... if that doesnt work you might have to go with something a lil more abrasive...

 

goto auto detailing supplier. see if you can snag a bottle of something that gets out heavy duty scuff marks. then try that.