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How to clean a keyboard
Shut down the computer and detach the keyboard connector before any cleaning procedure.
Do not remove or connect a keyboard while the computer is running. Doing so may damage the machine if you have a non-usb-based keyboard.
Detaching the keyboard while the computer is running is safe when the keyboard is connected to the computer via usb. For a quick cleaning, turn the keyboard upside down and use a can of compressed air to blow out any foreign matter.