Ice on the inside of the windscreen?

[dick dastardly]

As you've probably notced it's very cold today, -2 here as indicated on the car's external thermometer. I sprayed half a can of de-icer on all the windows but still couldn't see through the front until I noticed there was a very thin layer of ice on the inside of the car. I've never seen this before and had to wait about 15 minutes in the cold with the heaters blasting for it to start melting. Of course now I've got a dashboard which resembles a paddling pool.

How could this have happened? I haven't used the car since Saturday afternoon and there wasn't any water inside it the last time I checked. Could it be the pin-hole gap between the side window and frame letting moisture in?

[dick dastardly]

How can I stop this happening again? Waiting quarter of an hour in the freezing cold each winter morning for this crap to melt simply isn't an option.

[dick dastardly]

Will stick the A/C on full for the ride home then and cross my fingers for the morning.