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Hi Jimvoyager, personally I would be wary of cleaner spray with plastic buttons most say they are safe on plastic and I have been caught before. The plastic turns white and powdery then just disintegrates.
I have had a case where the board the switch was fitted to was not quite aligned correctly and this caused the switch cap to stick, opened it up slacked all the board fixing bolts and lined it all up worked a treat.

Ian B.