I sanded mine down and intended to polish up with scratch X.
I sanded the whole headlight though because the sun had put little crackles and glazed them. Scratch X didnt work too well getting it back to form, I used Autosol which was much more abrasive.. then Scratch X ... then SRP. Still dosent look perfect though.
Im waiting till my silverline rotary comes, that should sort them out.
You could sand them lightly and spend ages polishing them up by hand. It works, its just quite time consuming.