Water can not hurt electronics if there is no current running through it to short. You have to be 100% sure there is no current by removing any batteries on the board. I saw one time on The Screen Savers where they took a special liquid that does not conduct electricity and submerged a PC in it to cool it. It wasn't pure distilled water because thats a little too risky even though it doesn't conduct electricity.
So here is a new Electricity 101. Pure water does not conduct electricity. Water + impurities (like salt) conducts electricity.