When you use an ohm meter, you are applying the probes to the places you want to measure, and the pressure you apply can actually cause the probes to "cut through" a very thin non-conductive film. Besides pressure, the probe "scratch" through a very thin non-conductive film to make good contact, giving you a near 0 ohm reading, but the film is not actually cleaned off for operational contact. Hence, the tuner cleaner removes the film and all is well.
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