first thing DO NOT PUT POWER TO IT ANY MORE, electricity flowing thru liquid across circuits like that just causes corrosion faster, submerge the board in 97% isopropyl rubbing alcohol for a few mins and swirl it around to get any salt out from under or between any chips, 97% alcohol will evaporate very quick but let dry for a few hours then try it. i by no means am saying this will work but i have revived numerous liquid damaged macbook pros this way, one person managed to get a whole 16oz cup of cappuccino inside his, a few months later he brought me another with cola in it, 2 years later and still work like new.