To keep lenses from misting up, try one of these tricks.
Spray the inside with shaving cream or furniture polish, then wipe clean.
Wet the inside with a 50-50 mixture of liquid detergent and water; wipe dry.
Rub the inside with a cut raw potato.
Spread a thin layer of toothpaste inside the lenses, then wipe it off.
For a quick demisting, spit into the lenses and rub the spittle around.
