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Never tried the WD40 trick, but I had some window and door lock switches that didn't work, so I took them apart, and sure enough, it's just copper contacts, and they were all corroded. Cleaned them up, put some grease on them to hopefully prolong the time before next tear down, and they worked like a charm.
Only time a switch probably needs to be replaced is when one of the pins breaks off, only thing I've ever seen wrong with one that wasn't contacts.
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the chrome is all worn off mine, so why not