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Instructables user Teslaphonics writes:

Is that crackling and popping when you turn the controls on your amp driving you crazy? Here’s how to clean them and get back to the music.

There are spray “contact cleaners” available for this purpose, but in most cases just mixes the dirt and grime already inside with more dirt and assembly grease and may make the control operate worse than it is already.

How to clean amplifier controls