IBM Wireless Keyboard and Mouse User Manual page 20

2. Turn the mouse over, with the top side down, and look carefully at the
bottom. Twist the retainer 1 ring to the unlocked position to remove the
ball.
3. Place your hand over the retainer ring and ball 2 , and then turn the
mouse over, top side up, so that the retainer ring and ball fall out into your
hand.
4. Wash the ball in warm, soapy water then dry it with a clean cloth. Blow air
carefully into the ball-cage 4 to dislodge dust and lint.
5. Look for a build-up of dirt on the plastic rollers 3 inside the ball-cage.
This build-up usually appears as a stripe running across the middle of the
rollers.
6. If the rollers are dirty, clean them by using a cotton swab soaked in
isopropyl (rubbing) alcohol. Turn the rollers with your finger and continue
swabbing them until all the dirt is removed. Be sure the rollers are still
centered in their channels after you clean them.
7. Remove any fibers from the swab that might be remaining on the rollers.
8. Replace the ball and the retainer ring.
9. Turn your computer back on.
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IBM Wireless Keyboard and Mouse: User's Guide