Every few months the scroll ball on my Apple Mighty Mouse starts to get a bit intermittent because of the build up of dirt, fibres and grease in the mechanism, which is very frustrating. For the past few days I've only been able to scroll up, and reading web pages backwards is losing its novelty. There are a million and one web pages out there telling you how best to clean your ball, and I've tried several of them.

Some people suggest taking the mouse apart, but that apparently incurs a high risk of cracking it, requiring gluing back together, and is clearly an all round monumental faff, so I count it as an option of last resort which thankfully I've not had to employ yet.

Running a fine piece of sticky tape under the ball and flossing was a particularly delicate operation but didn't make much difference, so I don't recommend that.

Turning the mouse upside down and simply rolling the ball around on a clean piece of paper has the beauty of immediacy and simplicity and certainly helps a bit, but not if you've got major problems.

Best of all is the application of WD40 (or even vodka as one German YouTuber advocates) then a good roll around with a clean rag. The idea is to get your cleaning fluid all around the ball so it cleans the rollers underneath, dissolving the grease and lifting fibres, so I recommend long circular movements in many directions, trying to get the ball going every which way. A second application may be required. Don't use too much fluid though or it may wreak havoc with the inside of your mouse. WD40 is just viscose enough, and easily sprayed on in a small quantity, so it's controllable. It sorts me out every time.


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