Used the ball thingy (actually mine was more of a cone) with some polish. Polished each wheel for a good 20 minutes, buffed with a microfiber cloth, then polished/buffed again. Them used (BBS) Wheels ended up looking brand-fucking-new. Don't be afraid to put some pressure on the wheel/spokes while polishing (via the ball/cone do-hickey) if your drill can handle the torque.
http://www.columbusracing.com/forums/picture.php?albumid=731&pictureid=7313