Yellow, foggy headlights

[Northlands]

Not sure if the author realizes it, but many polishes are actually just very fine abrasive compounds (like a super-fine grit sandpaper) that, if your lens isn't too bad, will work to remove cloudiness.

That's pretty much what I did. I've an attachment on the drill for sandpaper, and stole a few grades of sandpaper from my wife ( she does glass and woodworking ). Worked better than any of those polishes they sell at Part Source/AutoZone/NAPA.

[MX793]

No need to, glass does not break down with exposure to UV radiation.

UV isn't the only thing that fogs/hazes the lenses.  Road debris (stone chips, "sandblasting" in the winter) will mark up the lenses too.

[Rupert]

And while we're at it, bring back the sealed beams! Much cheaper to replace if one breaks.