The mouse should be cleaned regularly to prevent germs from spreading. To clean the mouse you would need rubbing alcohol and a soft cloth use those items to clean the button and the top of the mouse to keep it as clean as possible. To optimize your mouse movement the mouse pad should also be cleaned giving better movement to the mouse.
If you want to extend the life of your mouse make sure to keep it clean 🙂
Do you clean your mouse? if so, how often? or do you simply replace it when it stops working?