Before diving and snorkeling, clean masks with Sea Buff pre-cleaner. Cleaning dive masks is a recommended step prior to anti-fog treatment. Sea Buff&';s concentrated and quick-clean formula removes the silicone residue on new glass dive mask lenses. For older gear, it removes dirt, sunscreens, and algae that can interfere with anti-fog treatments. Just apply, rub, rinse and repeat. Keep dive masks clean and ready for anti-fog treatment with Sea Buff. Prepping new dive masks by removing factory film Maintaining clear lenses with regular cleaning Supporting defog performance by eliminating buildup and residue Size: 1.25 fl oz Application: Rub on For Use On: Tempered glass lenses on dive and snorkel masks Made in the USA EXCLUSIONS: Not for use on swim goggles or dry lenses (e.g., eyeglasses).