I have read about people using headlight restoration kits, but having used them on actual headlights, I would be afraid of what might happen any of the chemicals seeped inside the slab. The seal is not 100% impervious.
Maybe some rubbing compound and the buffing wheel on a rotary tool would be safer?
You might want to try wet sanding. start with 400 grit and progress to 2000 grit or better. Then a spray coat of Krylon clear. Other than that, reholdering is the only option.
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