The 1st thing to remember if you think the inside electronics have gotten wet in ANY device is
DON’T try to turn it on!!!
If I were you, I would place the player in a bag of raw, dry rice to draw out any moisture and leave it alone for a few days to a week. Then, see if it will turn on. It may require a reset to do so, but DON’T try it until you’re sure it is dried out.