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Can I ask a simple question? Why?
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It is generally reckoned among radio amateurs that a clean variable capacitor leads to a more stable oscillator. I guess the dielectric constant of dirt varies considerably with humidity and temperature. Not really a problem with domestic sets, except on higher SW frequencies. Done badly (e.g. distorted vanes, wobbly bearings), cleaning could make things worse so I would leave well alone on a domestic set apart from a quick blow or a very soft brush to get the loose stuff off.