Yup! Sounds like paranormal wear and tear to me too.
1. Post a question to the "candyman" on the PTCruiserWorld forums. I believe there has been previous discussion/post about polishing light lenses and windshields.
2. Got/gettin the X-Pel 3M protective lens covers (40 mil I believe)for the headlights and fog lights. They are absolurtely invisible after dried. And, the material was developed for the safety glasses of our troops in the Middle East - to deflect shrapnel at 200mph!
3. Otherwise, check out some junk yards before paying for new lenses.