The trim around my windows was very oxidized and milky looking (as most of yours probably are), so i tried some turtle wax fine and medium rubbing compound. This didnt do a whole lot and what little it did do took a whole lot of work. I began rifling through some cupboards and found some "Wrights Silver Cream" meant for tarnished silverware, i almost put it back but then i read the directions and noticed that it worked on other metals as well. I figured i may as well give it a try and it worked!!! I guess the aluminum trim is basically tarnished, perhaps some chemical in the silver cream gets rid of it because it works a lot better than polish.