After a (clean) water incident, the most important things are to disconnect any & all batteries (inc backup cells etc.) as soon as possible to stop electrolytic corrosion.
Then take it as apart as practical, dry off any visible water and then, very important, leave in a warm dry place for at least a day before reassembling to make sure any remaining water evaporates (flowing air also helps).
Once closed up, there is no airflow, so water will stay in there indefintely, and run or condense elsewhere, and there may be water in small crevices like FFC connectors, which will start corrosion as soon as power comes back, but may not produce symptoms until days later, by which it may be too late to be repairable.