I use a product called "Quick Glo". Saw it on I think Jay Lennos garage and it did amazing things. Decided to give it a try for some old Harley rims I had. It worked so when I had a oil leak on my TTI's I gave it a try and worked perfect again. Non abrasive, and you use a soft cloth. Made by a local guy in Louisiana I think in his basement. Good Stuff and not expensive