

I myself haven’t seen Cherry MX keys with non-removable keycaps…
I just reread and realised it was the switches that were non-removable and not the caps. But then what seems to be the difficulty?
Is it perhaps that the liquid that you spilt, got inside the switch? - IDK how that would have happened, but in that case you will just have to disassemble the switch (yes, open the single switch) to clean it. It should be doable without getting its bottom off the PCB, just a little harder.
I was originally expecting the stick to be happening duo to the keycap and the surrounding stuff, but if it is the switch itself, then the previously given solution won’t work and you are better off using IPA and a Q-Tip inside the switch.
Maybe try one of these:
That explains the sudden drop, with legacy code being removed