Are you meaning internally on the selector swich assembly, if so servisol is pretty good, do not use wd40, as it can be corrosive on delicate electronics.
Now I have thought about it it was for my MAF sensor on my car as it said it was running lean. Introduced it some electrical spray and it solved the problem. It didn't dissolve the little thin wire so think it is fairly kind. That is fairly kind and not fairy kind.
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