22: Visibility Hack #2
Another way to get rid of fog on your windows is to turn the air conditioner on for a few minutes. The cold air inside the car will quickly evaporate most of the fog on the windows. Another idea that works well is to give the windows a good cleaning once a week. Dirty windows can also be a haven for fog and other elements when the temperature changes as well (via Family Handyman). So keep your windows clean on the inside to prevent fog from building up, or use your AC in a pinch to get the fog away quickly.