Ditto the effectiveness of Deoxit into switches and knobs. I recently dripped Deoxit into the series-wired mini-switches of my Atma-Sphere MP-1 preamp, which had become noisy to the point of frustrating dropouts in the balanced signal phases. After standing the preamp on end, dripping a fairly generous amount of liquid into each switch, then exercising the switch a few dozen times, the problems are all gone and good to go for another twenty years...
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