A CREATIVE CLEANING TOOL: Freefish's Keyboard Cleaner is designed for keyboard, car vent, camera, printer, cell phone, calculator, speaker and PC screen. The meterial is biodegradable gel and totally no harm to human skin. HOW TO USE KEYBOARD CLEANER: Press the cleaning gel slightly on the keyboard surface and then pull out slowly, the dust would be carried away with the silicone. (Note: don't press the silicone too hard, especially on mechanical keyboard). REUSED ABLE: Freefish's keyboard cleaner could be used for several times till the color turn to dark. When cleaning finished, just put the box at cool place. (NOTE: DO NOT wash the gel with water.)