As I was about to ask this question, I noticed this relevant question had just been bumped too - Should we make this question about downgrading iOS more generic?
There was a Question recently involving a water-spill on a Macbook. We do see a lot of these & linking them is not particularly easy as the symptoms tend to be different.
This Question -
No sound (speakers/jack) + microphone's dead after spilling water
has a great answer, a little harsh, but really hitting the spot on "what to do after a water spill"
I'm aware that to just leap right in & completely change the OP's post wouldn't really be right, but this feels like one occasion where the answer is canonical enough that it's worth looking at.
I'm not sure, even with consensus, it's one I'd like to tackle myself, but if a mod were to point it in the right direction that would feel more acceptable.
Or am I on the wrong track?
Opinions most welcome.