It can sometimes happen that you accidentally spill the coffee or ketchup on the mouse. The upper surface of the mouse can quickly get clean, while the coffee may enter inside the mouse. Cleaning the inside of the mouse is not that difficult as well. But you need to uncover the mouse to clean it. Apply some ethyl alcohol on a tissue or a wipe and wrap it up on a toothpick. With the help of this toothpick, you must clean all the dirt.