Welcome back. Lots of us phoenixes abound.... Contact cleaner sprays work well, btw.
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There is a spray contact cleaner named DeOxit, which works amazingly well for what you're talking about. You spray it on the pot dials, turn them back and forth a few times, that's it. I've always taken the unit's cover off, but if it's a hassle you might be able to just take off the knob of the dial.