I have a toyota yaris (my old car) and what I did to solve that problem was:
1. I wet sand the clear surface with 1000, 1500, 2000 and last 2500 grit paper. The grit could vary depending on how bad the surface is.
2. Once the surface is clean, I clear coated it with urethane (The same used on top of the base coat of your car). I put three coats, that is enough for the job.
3. After the clear coat was dry, I sand it and polish out all defect.
4. Done, I did that 5 years ago and the headlights still looking like new.
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