2000 Pontiac Sunfire headlight Lens

Rubbing compound and a lot of elbow grease. If it won't rub out you might have to sand it out. I have fixed foggy/dingy headlights by wet sanding them with finer and finer sandpaper until I can then use buffing compound to get them clear again. I mean start with like 600 grit and work your way up to 1000 then 1500 or even 2000 grit. I would try just the rubbing compound first however.