Good advice, I’ve genuinely never done that, just habit from a lifetime of winter.

That does remind me, though, I did find out years back that if you already have a crack, in my case a tiny crack from a rock, that hasn’t been sealed with a glass repair whatever it is they do, any significant amount of heat directed toward the glass in freezing conditions will cause the crack to spread. Bit. By. Bit. Suuuch a shit feeling to watch.