In the event your keypad no longer sticks to surfaces, remove the gel pad from the bottom of the keypad and rinse it under soapy water. When the gel dries, it should stick again.
If the exterior of the keypad gets dirty, one can take a damp cloth and wipe down the keypad. Ensure the keypad is entrely dry before using it though.
DO NOT, IN ANY CIRCUMSTANCE SUBMERGE SKIPPAD UNDER WATER.