1000 - 1500 grit

[HiFlow5 0]

I did this to my head lights not too long ago. Actually I would use 2000 grit wet dry sand paper. It will smooth out the headlight better and less chance of visible scratches. Of course you need to do this wet to prevent gouging. Mothers makes a plastic polish, this stuff works wonders! Buff the head light out with the mothers plastic polish on a dry rag and you end results will look great! Below are pics of my GT's headlights when I finished next to my LX's and you can see a tremendous difference.