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.