Clean them. Not exactly free if your time has value, But the result is worthwhile.
As our cars are 12-18 years old it may come as no surprise that dirt and such build up in the headlight buckets, on the reflectors and projectors and the backs of the lenses where one just can't get to conviently clean them up.
I had a cracked lowbeam on the left, and since I was doing all the lights for other people
it seemed I should bother to fix mine as well. Pulling the right along with it is inconsequencial as the left is the one that is hard to get at because of the charcol canister. Pulling the two 10 mil nuts from the power steering res, lifting it to the side then loosening up the ten mill bolt on the charcol canister allows you to slide it up and out of the way without removeing or damageing the hoses of either.

***DO NOT rub the reflectors, the silver comes off very easy. Clean very gently. You have been warned***

(click on pics for high res in another window)


Before and after..well After and before I suppose (parking/citylight)

after and before and (lowbeam) same setting, slightly different distance.





The wife said it looked toothless