10.3 Computer/Peripheral Hardware PM
10.3.3 Mice
There are two different types of mice, mechanical and optical. To keep them working smoothly, there are a few simple cleaning methods.

When it comes to a mechanical mouse, there has always been a cleaning issue. As dust settles on the mouse pad, it gets swept up into the moving parts of the mouse when it is used. This causes a buildup of a crusty residue on the rollers inside the mouse. The fastest way to clean it is to remove the plate on the bottom of the mouse, remove the ball, and then gently scrape the dust buildup from the rollers with a fingernail or another gentle scraping tool. However, some people prefer to use isopropyl alcohol or methanol with a cotton swab or Q-tip. Either technique will get the job done.

An optical mouse may need a damp cloth on the optical sensor surface. However, this could cause more damage and should only be done if absolutely necessary. Be sure to unplug the optical mouse when cleaning. Eyes should not be exposed to the laser.