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Don't spray DeOxit all over the tuner. Soaking phenolic with that stuff may be bad medicine.
Better to dab the contacts with a Q-tip dipped in DeOxit (or your favorite alternate cleaner). Don't use anything abrasive on the contacts.
You could also wait until you have a picture and then judge whether the tuner seems dirty. If it changes channels cleanly and you have a clear picture and audio, maybe it's fine.
Phil Nelson
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