Perhaps a bit of isopropyl alcohol and a q tip swab can solve the problem. using 91% isopropyl alcohol, dab a swab in the alcolhol and swab the alcohol onto the switch. the idea is to get a little alcohol into the switch but not too much. don't want to drench the electronics, just work a little alcohol down into the switch to try to clean it. try working the switch alternating with a little more alcohol. don't put too much alcohol. allow time for excess to dry if you think you got too much into the unit.
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