If the mouse still doesn't behave properly, try using a little rubbing alcohol on the cotton swab instead of water. Using it on the ball will really clean it off, but will also dry it out.

Using a household spray cleaner on the casing is not recommended, but can be the only way to clean off ancient grime. The danger is marring the finish of the case, so test it on a hidden area, and wait a day to see what happens

2torial #0554: Learn2 Clean Your Computer (Continued) Dust that computer box, inside and out The inside of your computer does not have to be cleaned often, but it should be cleaned several times a year. Look in your owner's manual: it will tell you how to open your computer casing. (These instructions are generally found in the section that tells you how to add expansion cards.) Check that the unit is unplugged. Before cracking the case, be careful to dissipate any static electricity by touching heavy metal objects, such as chairs and desks. Don't shuffle your feet on the carpet, and move around as little as possible while the casing is open.   Once the top of the case is off, you'll be able to see the circuit board and lots of other stuff. Take the can of air and with the extension, blow out all the dust. Work in one constant direction, and reach into crevices to get it all (don't force the extension between anything, though). There's no need to touch any part of the circuit board. Finish it off by removing the extension from the can, and blowing a few short blasts over the computer, to help keep any disturbed dust from settling back in. Before putting the top back on, blow out the stuff that's collected in the vents.   Once you've put the top back onto your computer, you can clean the outside. Spray some cleaning water onto a clean section of cloth, and wipe down the case. Be careful not to let water get into any openings or into the drives.   It's a good idea to clean floppy drives every once in a while. Now's a good time to do it. Just follow the instructions that come with the floppy cleaner. Step 4