So I've had this Mighty Mouse ever since they came out a couple years ago. Like most of them, it stopped scrolling down and I had to rub it upside down on some paper to clean it out. After doing this it was good for a couple months before I had to do it again. Lately (past month or so), it stops scrolling down daily and I have to rub the crap out of it before it works again for another few hours of use. I filled a paper cup with rubbing alcohol, pushed in the scroll ball, and poured the whole cup full down the opening, let it dry out, and it lasted a few days then did the same thing. So I'm thinking about soaking it overnight in a bowl of 100% rubbing alcohol, or watered down rubbing alcohol. If that doesn't work I'll run it over like iGary did.