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800 will have put deep scratches in the plastic.
Remove the lights from the car
wet sand with the 3000 to get a uniform smooth surface, a surface microscope will be helpful to see how you are doing ,this will take a while using a random sander or a DA.
Then use 3M professional grade polishing compound with a foam pad, all three grades one after the other. This will also take a while.
Clean thoroughly with solvent that will not harm the plastic.
Finally coat with a headlight restorer from someone like Maguire's.
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