NanoSafeguard Anti-Fog Treatment helps keep glass from fogging up. The treatment is perfect for bathrooms, the inside of car windows and other places where condensation is likely to occur. Its sophisticated chemical composition prevents water molecules from sticking together and causing visible droplets of liquid to form on glass surfaces.The treatment will not in any way alter the appearance of surfaces, nor will it crack, peel or discolor. It is very easy to apply and the effect lasts for weeks.2 bottle sizes to choose from:2 oz. Anti-Fog Treatment4 oz. Anti-Fog Treatment