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As an electronic repair technician I would never advise spraying deoxit on a circuit board or removing dust with a papertowel. May I suggest using a can of compressed air to remove any dust inside the unit and focusing the use of contact cleaner on potentiometers, input/output jacks, sockets/plugs etc. Cleaning the top of the circuit board will do little to nothing to improve the performance or sound of your amplifier as you will simply be cleaning the top side of components that are physically soldered to pads on the other side of the PCB.