From 
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1. Unscrew the ball-cage housing cover of a hockey-puck type mouse to remove it. Other mouse covers slide forward for removal.
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2. Scrape off any accumulated dried-on dirt from the internal rollers using the plastic cap from a ballpoint pen. Clean the trackball with denatured alcohol on a lint-free cloth. Blow out any debris, clean the rollers with a cotton swab moistened with the alcohol and reassemble the mouse.
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