My headlights on my '99 ES have fogged over on the outside. Anyone know anything that might cause this? A friend in the biz said something about a bad batch of lenses, something about UV additives in the manufacturing process. I would think someone else would have some bad lenses too if that's the problem. At 299.99 ea. I don't want to have to replace these more than once. Could it be something I've gotten into? Any ideas? TIA.