What can be used to clean up a "foggy" headlight?

try tooth paste. Not a gel type. But the older gritty Paste type, took the scratches out of plexiglass and the head lights on my truck.

if you make a paste of baking soda and water and rub it on in circular motions until covered, then rinse off, it should remove a lot of that buildup. If that doesn't cause a major difference, try adding salt to the paste and redoing it

There are a few different things you can try. One is a great product called awesome. Another, you can try using a paste of baking soda with a scrubbie of some type. Then there is using a steam cleaner.

Take your car to a body shop and they will buff it out, not a permanent solution but good. Maybe a "magic eraser" test in small ares first.

I've also heard polishing compound for cars may work. I tried the toothpaste method on my last car and it did help. Not 100%, but, better.

I understand that it is the effect of the sun on plastic and the only cur is replace the other headlight as well.

I hear toothpaste will clear up a foggy headlight. Might try that.

White toothpaste will clean it up, but you need to some sort of clear sealant on or the first rain will have it right back to where it is now .

Try WD 40