Quote Originally Posted by gothstone View Post
You can sand or polish by hand or with a kit. No matter how you do it your taking a thin layer off the plastic. You will also be taking off most of the UV protection, so after you do it they will yellow faster. Get a plastic UV protectant coating and apply it to the headlights every time you wash the car. The one I've been using is Bluemagic Headlight lens sealer because that's all I can find in my area. Before I started using it headlights had to be redone about once a year. Now I can go 3. I miss the days of sealed beams and new glass every time you bought lights.
I appreciated and agree with all your comments - except the word "sand".

It's a very fine line between fine abrasives and polishes. Even toothpaste is rather abrasive, compared to some compounds. Hand washing and use of a plastic polish will probably do the job.

I too miss the days of glass headlights. Nowadays they would make the entire vehicle out of plastic if they could, with products lacking durability or permanence: touted as "affordable" and soon disposable, by design.