demist BrE
defog AmE

It's a giddy time, and giddiness can defog the mirror.

Lucy paused in her attempt to direct a blast of hot air from the heater so it would defog the glass.

He also mentioned that it was raining hard and, without air-conditioning, he had the heat on full blast to defog his windows.

For example, it can defog glass, and it can also enable oil spots to be swept away easily with water.

One point that may be of interest to those who have never had them is this: Breeze windows also act as backup to defog your windshield should the blower break down.

On entering the steamy shop I had to wait for my glasses to defog before I could see the neat little display of pierogi and various delectable salads.