While there are numerous aluminum polishes out there and we all probably have our favorite,mine is a product called DURAGLOSS ,,Its a treated material and will do quite a job polishing it and will with little work make it mirror shiny,,I have used it for years on my race cars and my Weld's on my trucks and it seems to hold up nicely to the adverse elements that mother nature can dish out,,On my fuel tanks on my tractor cab at work it even hold up nicely in the acid wash bay we use to wash our complete units,,If you can not find it let me know and I'll get a can for you.....