I have been using it for the past 2 years when I want to avoid using pinlock and the internal visor for the sun. Indeed, it protects quite well from the visor fogging up, but... what it does is trap the moisture which then forms condensation on the visor. It may not fog up, but after a while, you start seeing it like the car window in the rain when you don't use the windshield wipers.

Very good guys and it actually does what it says. I cleaned the inner membrane (glass) of the helmet with a tissue, sprayed the entire membrane and wiped it again with a tissue. And I was very satisfied. It doesn't fog up at all, not even a bit!!! I will see how long it lasts and will comment again

Excellent and lasts for days on both the helmet and the glasses, as long as it is not cleaned with a microfiber cloth neither during application nor afterwards

It doesn't do what it promises! I tried it on my nearsighted glasses, followed the instructions that say to spray and then simply wipe with a dry cloth. So, I wiped with the glasses cloth, but the glasses kept fogging up inside the helmet and the vision was even worse because this liquid is like soap and it caused smudges!

It does a very good job and keeps both the visor and glasses clean without fogging up... I also use it in the waterproof case and on the lens of the action camera during winter.

Good but up to a certain point, if it has more than 85% humidity outside, the visor will still fog up inside, not too much but enough to bother you.