Targus Screen Scroller Mouse User Manual page 7

4 Turn the mouse over and rotate the mouse ball retainer
counter-clockwise until it's loose.
Unlocking the mouse ball retainer
5 Remove the retainer and the mouse ball.
6 Clean the mouse ball and the two black rollers inside the
mouse using a lint-free cloth or cotton swab and rubbing
alcohol.
Removing the mouse ball
Cleaning the mouse
7