Mouse scroll ball only works downwards

The scroll ball on my mouse (which came with the computer) only works when scrolling downwards. It was OK yesterday. Any suggestions?

Cleaning the ball is temporary at best. Most of the time the problem is not only a dirty ball but dust and dirt on the sensor below the ball. This is what works for me every time:
Place a piece of clean white printer paper on your desk. Disconnect the mouse and turn upside down on the paper. Push down on the mouse so the ball compresses on the paper. Now virtuously move the mouse ball on the paper (fast, up and down, in circles for about a minute). You should see little bits on crud on the paper when finished.

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