Turn off the mixer, and unplug its main power cord. Disconnect all microphone, instrument and RCA cables from the connectors on the mixer.
Remove the knobs from each section of the mixer, and store the knobs in individual plastic bags according to section. Most knobs can be easily pulled from the mixer. For instance, store the volume knobs in one plastic bag, and the equalization knobs in another plastic bag.
Loosen and remove the Phillips-head screws along the mixer's external housing. Grasp each side of the top housing, and lift it off of the rest of the mixer to reveal its internal components.
Use a can of compressed air to blow out all loose dust and debris from inside the mixer. Apply some rubbing alcohol to a clean wash cloth. Wipe down the circuit boards, transistors and audio connectors from inside the mixer.
Use a wrench or pair of vice grips to tighten all loose audio connectors inside the mixer. Replace the mixer's top cover, and re-fasten all Phillips-head screws to the mixer's housing. Replace all knobs and buttons.