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My headlights are all gross. They have like a film on them that I can't get off. I think it might be like hard water but I am unsure. A friend told me turtle wax would but I tried Wolfgang and no luck.
I've heard that aluminum polish should do the trick. If not, take some very very fine sandpaper. Get plenty of water on it, and sand the headlights very lightly. Be extremely careful, if you try that.
It is on the outside. One guy said to vent his headlights he drilled three really tiny holes in the headlights. Not something I would do but it might make sense to you.