ABSOLUTE DEGREASER 50ML C4 Stop fat with ABSOLUTE C4 degreaser in 50 ML effective and practical... The first cleaner specifically designed for diving masks, new or used, new or used, that prevents fogging without side effects. Available in 50ml sizes. Manual : - Spray directly on the inside and outside of the glasses and on the internal surface of the silicone skirt (recommended quantity: 7 - 8 ml). - Rub the inside and outside of the glasses for 4/5 minutes with a toothbrush or a soft cloth. - Leave the product on the mask for 10 minutes then rinse with fresh water. Repeat the procedure (Phase 1+2+3)