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They usually grow from the metal on the terminals and or the casing.
Usually if they are growing on fixed parts they'll make a fixed short that will stay. If they grow on or in the path of a moving part like the wiper they'll make and or break contact as you adjust the pot.
An easy first round clean is to hit the exposed terminals with a toothbrush and possibly something to dissolve them.
If that don't work you can dismantle the pot and lightly sand and polish the metal surfaces.
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