I've had my MSP for close to 4 years now. I noticed recently vapor lines in my windshield. I see them when I am driving and the sun is beating down on my windshield. I don't see them at night or on a cloudy day. I tried everything to clean my windshield. I took it to the dealer and they couldn't find anything wrong because ofcourse it was a rainy day. They put some stuff on it but it didn't help. I tried using my finger nail to scrap the stuff off but it doesn't move. It looks like it inside the windshield. Is that possible? I don't smoke inside my car. I need to get this figured out becasue my warranty is up in June. Anyone else experience this? Search came up empty. I'm going to try to take a pic tomorrow while driving.