Apple Power Macintosh 9500 Series - Manual (Page 134)

2 Turn the mouse upside-down and turn the plastic ring on the bottom counterclockwise
to disengage it.
If you have an older mouse, 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.
4 Clean the three small rollers inside the mouse with a cotton swab moistened with water.
Rotate the rollers to clean all around them.
124 Appendix A