Link via macosxhints.com
I’ve previously used Apple’s suggested method of cleaning a trackball by holding it upside down and pressing hard on the ball, but the dirt and grease had built up on the ball to a point where this method didn’t work anymore. From the link above, I found out the idea of using isopropyl alcohol and a Q-Tip to get rid of the dirt, and it worked fine. Please not that after you get some response from the ball after the initial cleaning, please give the ball and its socket some time to dry to truly test how well the cleaning has gone. I expect to use this cleaning method again with two young kids and I who love to munch and use the computer.