Unlike older "ball and roller" style mice, optical mice use camera and digital technology, which usually does not require extensive cleaning or additional maintenance. That being said, a Microsoft Wireless Mouse 3000 can develop tracking or other problems that may require a look inside the case.
Shut down the computer or laptop. Unplug the Microsoft Optical Mouse 3000 wireless USB receiver from the computer's USB port.
Depress the silver button located at the base of the mouse to release the unit's battery cover. Remove the battery cover and the single AA battery inside the casing.
Use a small flathead or jeweller's screwdriver to gently pry off the unit's left and right mouse button assembly. (The left and right mouse buttons are comprised of a single piece of moulded plastic that comes off as a unit.)
Turn the mouse over and use your fingernail to pry off the four rubberised feet on the bottom cover. Remove the four screws (one under each rubberised foot) with a cross-head screwdriver.
Slide the two sections (top and bottom) of the mouse casing apart. The bottom section of the mouse houses the circuit board, antenna, scroll wheel and other miscellaneous parts. The circuit board will easily lift out of the bottom section once the four case screws are removed.
Follow the directions in the Microsoft Wireless Optical Mouse 3000 user guide to troubleshoot any performance issues. Disassemble the mouse only if necessary. Avoid scratching or gouging the circuitry and optical lens while taking the mouse apart. Do not allow any liquids or debris to drop into the mouse cavity.