I got into vaping through a friend of mine who made the switch over the summer. I noticed when I was in the car with her in the summer, there was little-to-no film/gunk on her windows at all--reinforced by her celebrating when it came time to clean her windows and there was no cigarette smoke build-up to worry about. But, now that we're approaching the winter months and the temperatures have plummeted, I've noticed that SOME of the vapor seems to cling onto the windows? It's nothing too serious, considering a little bit of Pledge Multi-Surface and a microfiber towel took it right off, even after letting it build up for a few days. We vape in her car quite heavily, several days a week. Her juices are typically high in PG and nicotine whilst mine are 100% VG and mild nicotine.
So I don't know any of the sciences behind this, but part of me wants to say the temperature has something to do with this?