After using the device, remove the sleeve and rinse it under the tap. For a more thorough clean, you can turn it inside out like a sock. Make sure to only use water, no soap or chemicals. Once it's clean, let the sleeve dry completely before putting it back into the casing. The MYHIXEL II device has an IPX7 waterproof rating, allowing it to be washed under running water. In contrast, the MYHIXEL I device does not have this protection, so you must be careful not to get the internal components of the casing wet. We also offer a cleaning spray: MYHIXEL Cleaner.