A heads-up that this works *super* well for some reviewers, but not all — note that this is meant for non-antireflective-coated lenses, and the instructions for use are very specific. To apply, spray a small amount on both sides of your lenses, and use your fingers to rub it across the whole area. Let it sit for a full minute, then wipe with a dry soft cloth. Once they're fully dry, you should be raring to go!
Promising review: "I am vey happy with this anti fog spray. It works extremely well in preventing my goggles from fogging up. Due to fogging issues, I was buying new goggles monthly. I have not had to buy a new pair since I started using this product. It’s saving me money in the long run. I highly recommend it." —ARTHUR VAGAS
Another promising review: "I was given this product as a gift by my sister, who was clearly tired of my frequent complaints about my glasses fogging up when I use my COVID-19 masks. It absolutely works like a dream, especially after the second application. I used it the first time and did not follow instructions (wiping glasses in a circular motion). It worked about half way, and I was happy because it beat the heck out of full steam ahead glasses. The next time I prepared to go out I used it again, and followed the instructions. It worked 100%. I don't know if it is a cumulative effect or my now expert level lens-wiping technique, but I was super pleasantly surprised. I reapply every two to three days, even though I don't go out that often. The reason? I discovered, by complete accident, that my glasses are no longer covered in smudges and smears like they usually are. I was used to wiping down my glasses two to three times daily because facial oil would get on them, and because apparently I am incapable of refraining from touching my lenses. So, this stuff has become my go to for glasses maintenance. I paid a lot of extra money for a coating on my lenses that was supposed to prevent smudging, and it is useless. I will be investing in bottles of Fog Gone from here forward and will save my money." —Jeri
Get it from Amazon for $10.55.