Ball on Apple Wireless mouse no longer allows me to scroll

Normally that's caused by debris under the trackball preventing the rollers from moving. Turn the mouse upside down and rub the trackball Vigorously with a microfiber cloth.

The symptoms are usually that scroll will work one direction but not the other.

Captfred

I doubt it's the ball. It's always been the ROLLERS that get contaminated. This then blocks the ball from rolling the rollers properly.