For Grownups > Swim & Snorkel Gear > Swim Accessories: Aqua Sphere Defog: Gentle Enough for Swim Goggles, Strong Enough to Work! Prevents fogging of any swim mask or goggle lens. Apply to an already anti fog coated lens to enhance the action. Instructions for Use: Squeeze one (1) drop onto each lens and gently apply with finger and let sit for one minute. After one (1) minute rinse each lens thoroughly with cold water.