Always had a bag on the dash---in my younger years I tried broke up cigarettes in a chunk of pantyhose----didn't work---if I remember right, after all that was 55 years ago.Chief had 2 window anti-fogging tricks. Rub inside of glass with 1/2 a cut onion & the other was to rub the damp glass with a bag of Bull Durham tobacco, with the label ripped off. Bill W.