Apple Power Macintosh 7600/200 Series - Manual (Page 219)

Cleaning the mouse
The mouse contains a small ball that must roll smoothly for the mouse to
work properly. You can keep this ball free of dirt and grease by using the
mouse on a clean, lint-free surface and cleaning it occasionally.
You need a few cotton swabs and a clean, soft, lint-free cloth.
1 Turn off your computer.
2 Turn the mouse upside-down and turn the plastic ring on the bottom counterclockwise
to disengage it.
On some mouse devices, you may need to press the plastic ring (rather than
turn it) to disengage it.
If the mouse is locked, see the next section, “Locking and Unlocking the
Mouse,” for instructions on how to unlock it.
3 Turn the mouse right-side up with one hand and catch the ring and the ball with your
other hand.
219 Health, Safety, and Maintenance Tips