HOW DO I CLEAN A MOUSE?  (1.3)
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       Poor mouse tracking is normally a sign of dirty contacts.  To 
  clean them get a cassette tape head cleaning solution from any audio 
  store.  Turn off the Mac.  Then unplug the mouse.  The bottom plate 
  of the mouse that holds the ball in place can be removed by pushing 
  down and twisting (like a child-proof medicine cap).  The ball will 
  probably fall out when the plate is removed so be ready to catch it.  
  There's nothing quite so annoying as having to crawl around on the 
  floor looking under the furniture for a mouse ball.  Dip a cotton 
  swab in the solution.  Then rub it on the three ball contacts until 
  they appear clean to the eye.  Finally clean the ball itself with 
  soap and water and dry it with a paper towel.