Power OFF, of course...Remove the ball, GENTLY pick away the buildup from the rollers (Trying very diligently NOT to let the pickings get deeper inside the mouse...Hold it at an awkward angle if you must, with the "HOLE" pointing down, working from up under the mouse body...This is nothing more than lint and debris picked up over time...anyway, --->>> GENTLY <<<--- remove the buildup, trying not to "LEAN" on the rollers too much...
Get a Q-Tip (Little stick with a cotton swab on the end), toilet paper twisted up, or, some other resonable SOFT cleaning tool and dip it in some isopropyl alcohol, or, stereo head cleaner, something of the sort, and...again, GENTLY, clean the rollers with it...Lastly, soak a paper towel in cleaner or alcohol as well and give the ball itself a wash and scrub down...GOD, that sounds all TOO sick...LOL...Put it all back together and mouse away...
Later, if you have the grip ($$$), spring for a quality laser mouse and throw away the GRAMPA ball mouse...Sorry, even withthese, sometimes you still have to clean the little laser window on the bottom...
Hope that helps...
Quik
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