If you can, flush the remote with Methyl or Ethyl alcohol.
It will combine with the water/moisture and then evaporate to a dry condition.
Better if you can open the remote case in order to do this, but it can work if you can get any into it at all, try through the battery compartment.
The biggest problem is that the battery in the remote + the Tin in the solder + water as the electrolyte will "grow" tin dendrites on the circuit board that are conductive and grow "shorts" that keep the circuit from operating correctly.
If you can get to the circuit board, brush it with the alcohol in order to remove the dendrites, both sides.
I have saved several marine radios and cell phones this way.