Pin cleaning kit talk after a flap position sensor fail

Last Tuesday we had an A320 with a flap position sensor showing wild values, false warnings all over the cockpit. Turned out corrosion on the connector pins, nothing else wrong. I used to just spray contact cleaner and call it done, but spent three hours chasing gremlins because the pins looked fine under the borescope. A senior guy showed me his fiber optic pin probe and a tiny jewelers file, said surface crud is the enemy. Now I inspect every pin under magnification before anything else, especially on older ships. Anyone else swear by a specific pin cleaning method that actually holds up for more than a few cycles?

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