So i just redid almost everything on my bike, and everything looks sweet and new except the brownish stained and oxidized cylinder and cases. so how do you guys clean yours? the previous owner apparently didn't care to clean the machine after he rode so now I'm stuck with cruddy looking stuff. I polished all the covers,water pump housing, powervalve, etc and used grey scotchbrite on the head but im stuck scratching my head at the cylender short a roll of sand paper by hand and a hand polish, which would be my last resort. thanks all!