I recently threw a pint of milk in my laptop accidentally, I removed the keyboard, soaked it in a bowl of hot water (hot to touch, not near boiling), slushed it around in the water and then gave it a long and thorough washing under the tap, wafted it around to drain as much water out as possible, put it on end and left it to dry for over 24 hours - keyboard works fine.
If it is only one key, then it is unlikely that it is anything to do with the ribbon-cable as this would cause more than one key to malfunction (you don't have a separate wire for each key).
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