Review on OptiPak Anti-Fog Microfiber Cloth Wipes for Clear Vision: Glasses, Binoculars, Face Shields, Ski Masks, Swim Goggles - Fog-Free Performance on Eyewear, Mirrors, Lenses, Windows (3 Count) by Jenny Davis

I was looking for something to help with glasses/sunglasses fogging when wearing a mask. These cloth napkins work very well. Seems to last for a few uses; A word of caution: if you get your glasses dirty and don't have one of these wipes with you, cleaning with a cloth, gloves, etc. will remove the coating the wipes have left on your glasses. Found this out today while walking and got a stain on one of the lenses - wiped with one of the fingers on my glove and lo and behold the glasses started fogging up all over! Another thing I'm not sure about is how long any of the cloths will last - the instructions say they are not machine washable.