i’ve tried about 5 different "anti-fog" products including home remedy toothpaste, spitting, and underwater mask clear, all to no avail. The only thing however that i’ve learned that works, is I had to buy a new mask (softer rubber, especially around the nose) and NOT exhale thru my nose! I found that was the ultimate reason why my mask always fogged in the first place. It’s not easy, but I don’t have the fog problem as bad anymore.