Preventing condensation/fog on glass

[Jeremy]

Is there a flim covering or spray to prevent condensation and fog from forming on the glass? Do they really prevent condensation and fog or do they just direct the water away from the glass? And where can I find these films or sprays?

[Rick Barry]

Jeremy,

Spread shaving cream (the cheapest white stuff) over it and wipe off. It works on bathroom mirrors, anyway. Repeat once per month.

Regards,
Rick

[Jeremy]

I tried shaving cream. There was so much condensation last winter that it just washed the shaving cream off after a couple of days.