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Note pots and tuners are two different things and WD-40 wouldn't "detune" a pot, nor is a pot likely to have sparkworthy currents running thru it, so on pots it might not be too destructive. The original question was for tuners. If I have a scratchy pot and spraying something on it won't get it done, I disassemble it, scuff the wiper with a soft pencil eraser 'til shiny again, clean the carbon ring with plain-ol' drugstore isopropyl alcohol and Q-tips. A dab of 3-in-1 oil (not even 1/10th of a drop) wiped over the carbon ring. Reassemble. Works every time, long-term results.
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