Blue Merlin Anti Fog Spray | Eyeglass Lens Defogger for Glasses, Sunglasses, Safety Goggles, Ski and Dive Masks | 4 Oz Bundle with Cloths

I have used Blue Merlin Anti Fog Spray on 3 pairs of sunglasses. I work in a vegetable garden and play senior softball, 9:30AM to 11:30AM. Previously, had problem with sunglasses fogging on hot/humid days. This spray completely eliminated all fogging. It has lasted 4 days (I only purchased it 4 days ago), so not completely sure about longevity. I sprayed it on clean glasses, waited 5+ seconds, wiped dry with provided micro-fiber cloth. Simple to use. Excellent product.

Cleans the glasses well but doesn’t do a thing about them fogging. I can use this, drive 15 minutes, get out of the truck and my glasses fog right up. Same with being outside and going inside.

I work in a freezer so I'm sure it works great for less extreme temperatures but lasted like an hour max.

Had to change my review... unless you use it within seconds of experiencing humidity.... it really doesn't work.I used it this morning and not even 30 minutes later... could not see... wiping my lens over and over. Too bad.... I need something that WILL WORK

Works as advertised, and stopped my sunglasses lenses from fogging. I'm very pleased with the results.The only downside is the spray bottle. On one of the bottles I ordered, the spray pump was not twisted down all the way. Because that bottle was placed on its side inside my car's glove box, 98% of the contents had leaked out and evaporated by the time I went to use it again. So make sure the spray pump is twisted down tight onto the bottle!

I work in a restaurant and have to do inventory in coolers and freezers. My glasses always fog up. I was hoping this product was a solution to the problem but it does not work. If you are going from inside a freezer back to regular temps the glasses still are foggy. Its a ok glass cleaner but I can get glass cleaner cheaper. Waste of money.

Did not work on first try on my m/c full cover face mask in 34° weather. On second try I applied the spray and allowed it to dry. Then buffed w/supplied cloths and it worked great in 35° weather.

I swim everyday and this is the absolute best spray leaves glass crystal