How do you guys keep your polished aluminum...polished?

I normally don't like using clear coat on engine components because overtime the heat yellows the clear.

as for powder coat.....I have a powder coating setup but I am actually currently selling it.....plus I like the look of the polished aluminum more.

it hasnt got out of hand yet...but its starting to look kind of foggy, it polish's right back up easy enough and all....I was just seeing if there was a product or a trick or tip that would help deter the oxidizing to begin with.

ill look into some of the products mentioned. thanks again!