yeah, if your headlights look foggy it can be because either tiny pieces of grit have over the years pitted the glass and made it less clear or because water has gotten inside the headlight and is fogging up the inside.
toothpaste works wonders on the pitted headlight. Just enough polishing grit to polish the glass without scratching it.
If it's got condensation in it, the trick is to remove the headlight and dry it out with a hair dryer (set on no heat). Then get silicone caulk and re-seal all the seams in the headlight. Check the gasket in the headlamp holder as well. Reinstall and it shouldn't get water in there anymore.
Some guys also drop a silica packet (those "do not eat" packets you get in stereo boxes) in the headlamp. It absorbs the moisture and keeps it from fogging up.
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