I would have thought that in the design phase of the centre consol the possibility of drink spillage would have been addressed.
There was an Airbus memo for flight crew years ago about flight deck tidyness.
I had dealings with a man from Bendix many years ago who was involved with the DH Comet auto pilot flight trials. He said there was a big problem with condensation in the cockpit and water would drip onto the control yoke such that the pilot would get an electric shock from the autopilot disconnect switch. (120 volt DC I think)
This was solved by rolling a condom over the horn of the control yoke.