I spent 10 years servicing organs and amps. You probably won't believe this but WD-40 works as well as anything for noisy volume controls. Just stick the red tube by the slider and give it a good shot. Then work the slider up and down fast about 10 to 20 times. I would purchase contact cleaner for dirty key contacts or relays but for noisy pots WD-40 works great.
Tom
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Thanks,
Tom