I hope you unplugged it quickly and shut it down. There may be some lasting damage, but water isn't one of the more corrosive things. It can contain corrosive elements, but it's nowhere near as bad as juice, coffee, soda, etc. I would give it a few days. The purpose of the rice is just to absorb moisture. If it was something other than water, I would suggest cleaning with isopropyl, preferably of a very high concentration. The reason for that is that it's not conductive.
6/30/14 at 5:36pm