This happens quite often (I call it "bar rot"), and many times is a result of
not washing your hands well after handling citrus fruit. The best way to
resolve this is to keep your hands clean, and DRY at all times - however,
being a bartender, the "dry" part is nearly impossible.
Here's a thread where Miss Charming makes a very nice suggestion on what to do:
[THE OLD GUY] BAR ROT
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Cheers! - Josh @ BarSim
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