Sandpaper. We've sanded our headlights ending with a very fine grade sandpaper and got the yellowing and scratched up outer surface off. Now they are much more clear! Look online for guidelines. Hope it goes well and they shine clear again!
Having worked in and out of Body Shops all my life I have seen a variety of processes used. The best is a professional kit produced by 3M which the shops usually charge anywhere from $39.95 to $69.95 and it does look almost as good as new.
However depending on the vehicle age, you can actually purchase either After Market or Re-manufactured Head lamps from your local parts store or on line for about the same price. You can also purchase a repair kit now for about $9.95 at most Walgreen and Wal-mart stores which works fine depending on the age of the vehicle. Hope this helps.
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