I bought a $14 aluminum polishing kit from harbor freight it comes with two cutting/polishing compounds and a fine polish/shine compound and an assortment of different polishing heads for use on a drill. If you have a bench grinder they also sell polishing wheels at harbor freight for like $5 each get a wheel for each compound don't mix compounds on your heads or wheels. Do the big spots on the bench grinder and the tight spots with a drill and polishing heads. Start by sanding the aluminum with 220 or 400 grit I do a round of each then a round of 600 grit or higher befor you start polishing with the black or cutting compound. Here's my stock swinger I literally only spent maybe a total of 3 hours stripping the oem coating sanding and polishing. All the polishing was done on a bench grinder/wheel.