Special dive mask pre-cleaner or slate cleaner. McNett Gear Aid Sea Buff carefully removes the silicon residue which exists on all new dive mask lenses due to the manufacturing process. Removal of this residue ensures that future applications of Sea Drops™, Sea Gold™ or Sea Quick anti-fog products are more effective. DIRECTIONS FOR USE:Clean new mask lenses with Sea Buff™ mask pre-cleaner. This removes the silicone residue leeched from the mask skirt during manufacturing, and enables anti-fogs to work more effectively. Regular cleaning with Sea Buff eliminates dirt, algae, mould and other contaminants that interfere with anti-fog performance. DIRECTIONS FOR USE: STEP 1: Apply a small amount of Sea Buff to inside and outside of lens. Rub aggressively, rinse and repeat. STEP 2: Buff with a soft, dry cloth until clean, then rinse thoroughly. STEP 3: After cleaning with Sea Buff, apply anti-fog (Sea Gold™, Sea Drops™ or Sea Quick™) to inside of dry lenses. STEP 4: Rub in anti-fog with fingers. Rinse in fresh or salt water. DO NOT USE ON SWIM GOGGLES