They will most likely have a protective clear coat over the alloy.....to get that off to polish them, you will need to use something like paint stripper first. Then after that you can go to town using Steel wool and Autosol (works great for me), finish off with a rag and just the autosol polish and put some elbow grease into it. If you don't like the idea of hard work, you can go to bunnings and grab a product called Joyco? i think it is.....they have small buffing attachments for power drills to make buffing and polishing easier. :y: Hope that helps.