Chosen Solution
On a 15” MacBook Pro Touch Bar how do I clean coffee spilled onto and behind keyboard keys resulting in non-responsive keys?
Replace the keyboard, it is not of any use if the electronics inside of the keyboard is irresponsive, you can temporarily use external keyboard but you need a replacement . I had dropped beer , had kept it upside down for couple of hours but couldn’t save it completely . Salt n sugar in the water make electric charge conduct so that’s harmful for electronics . I suggest you to replace the keyboard.
