![]() While all contact cleaners work on metal-only parts, most will actually destroy plastics and safe lubricants found inside and outside of almost every volume control potentiometer and switch. Contact cleaner is a spray or liquid product that is designed to dissolve corrosion on metal electronic parts, typically the main cause of scratchy and popping sounds while moving volume controls or intermittent rotary or push-button switches (for speaker selections, modes, source) headphone or microphone jacks, etc. Purchase a bottle of contact cleaner which is labeled as "safe to use on plastics." This is extremely important.
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