Our mouse is jumping all over the place. Have

Take out ball and clean the small wheels with a Q-tip and alachole, they get dirty and go crazy.

With a ball mouse the parts to clean are the two small spindles inside the mouse (they usually have little gears on the end of them). They run at 90 degrees to each other and over time dirt and grease build up on them. It can be quite difficult to remove. Scrape it off with a cocktail stick or similar - you will need to turn the spindle as you do this to completly remove dirt on all sides of the spindle.