I was suspicious at first because of the bad reviews, got me to spray but then ordered because my new swimming goggles is totally fogged in spite of alleged anti-fog coating to two lengths. Have the spray sprayed on the eve on the inside and allow to dry for a few hours, then everything rausgewischt with kitchen roll, so that the glass is no longer cloudy. The next time you swim briefly rinsed with chlorine water and losgeschwommen, absolutely no fogging even after 2 hours not. After swimming the I rinse the glasses with plain water from the shower, when it is dry, I spray it inside a new and wipe everything dry again the next day from. I'm impressed, you can even swim with it twice without it starts. In the past I've tried dishwashing, or spit in, or with the tip of the tongue - which has held more than 5 lengths, then it is aungelaufen again. This stuff might be toxic, so I let it dry for so long, and wash it before swimming again from - irritation I did not get it. # Even my Schwimmkammerad has bought the spray now, we swim with it in natural water as well as in the lap pool and it works fine! Even my shooting glasses, which starts again in the shooting range, so I spray a, it does not restart, my helmet visor is sprayed with it. Just great!