The best remedy for aluminum parts is 1) use paint stripper to remove old clear coat, 2) buy California Custom aluminum deodorizer and purple polish, 3) use 0000 steel wool to scrub all the aluminum to uniform appearance, it will look grey. You will see a chemical reaction, like steam coming off while using the steel wool dipped in the deoxidizer 4) polish the parts with their purple polish to a near chrome shine. I do it by hand, but you could use a powered wheel. Nothing as good as this combo an I've tried everything. Once finished no clear coat needed, just an occasional quick once-over polish. I can only find these products sold online, no store here has them.