I have a 2012 XC70 T6 with HID Xenon headlamps. Being anal, I wrapped more or less everything at the front with 3M rockguard film including the headlights. For the last few years I have been seeing a fog develop where the light shines on the headlight lens. I am not sure if this fog is on the outside of the headlight or inside. I suspect the fog is due to heat damage to the headlight lens and am wondering if I should have the rockguard removed to prevent further damage. Although the damage might have reached it's worst, so perhaps taking off the rockguard now would only make sense if the fog can be removed from the outside of the headlight.
I have seen a small amount of talk about rockguard film not being recommended as it keeps the heat in, and therefore jacks the lens possibly.
Any advice on this would be most welcome. I remember the guy who put on the rockguard wondering if it was a good idea to put it on the headlights!
Perhaps it's normal for these HID headlamps to develop fog where the light shines. It's rather a shame really because, the car is really nice other than this blemish.