It's cold and damp here (in France) now; consequence my 940 ('92 sedan) is seriously steamed up inside. It got so bad yesterday that my wife had to get out the car to help me reverse. Obviously demister helps on the windshield and the rear screen (after a while), but all the side windows are pretty bad too and don't seem to clear up when driving.

I checked the front door window vents and there's no effect when the fan's on (even though the passage is clear and hot air comes out the dash?)

Any other way of keeping windows clear (it's pretty cold to have all four windows open).