Yes it is possible to remove scratches and brighten the lenses up I correct the lights on all my correction details when I carry them out, but there is not a great deal that you can do with the stone chips. In most cases I just machine the lenses with a spot pad, I only usually sand paper the lenses if they have yellowing or are very badly scratched.
How much would you charge just for a headlight restore? How long would it take? I was thinking of coming over one day and getting it done by you whilst I wait if that was possible? Thanks!!