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Some real tobacco pipe cleaners (not the dopey (f)arts'n'crafts ones) have a thinner metal core than a 7 pin tube socket.
My default 7/9-pin socket cleaning method is hose tube base pins with contact cleaner till drips hang off the pins, possibly the socket too if I feel it is necessary, then rapidly insert and remove the tube 3-10 cycles.... that usually does the trick except in sockets corroded badly enough that changing them was basically needed anyway and sockets that no longer grip on all pins.
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