A problem might be that you have turned it on already. Years ago, a friend left his Toshiba laptop under a leaky window, it got wet, and he dried it slightly and then turned it on (you know, in a bit of a panic to see whether it was damaged). That cost him a new motherboard.
Next time it happened (I know, I know,move it from under the window... was not my computer nor my window though), he waited DAYS before turning it on, waiting for it to dry completely, assisting it with fans, warm air blowing over it, etc. That time he started it up and everything was fine, even though I think it got more water on it that time than the first time.
THEN he fixed the window, so there was no third time.
OTOH, since what it done is done, it probably can't hurt to try, as long as you are careful not to cause more damage (to something else that isn't already damaged).
Miss Terri