I have used it on my glass, glasses. And some forms of plastic, glasses, without ill affect. However it does say specifically not to use it on prescription glasses, due to the many varieties of plastics that are out there, and the coatings that may be susceptible to that chemical.
How do you keep your glasses from fogging up in the rain?
- Use anti-fog wipes.
- Clean your glasses with a small dab of shaving foam.
- Rub a small amount of pure white bar soap on your lenses, then buff off.
- Apply anti-fog paste or spray.
- Use rain repellent on glasses.
- Clean them with your saliva.