Let it dry. COMPLETELY. Do not try turning it on, you may have already ruined the phone. Get some rice put it in a zip lock bag and leave your phone in there for a few days. Then you could leave it inside a hot car for a few days. There is no guarantee that it'll work, but most likely you have a paper weight. You could disassemble the machine and check for corrosion on the wires, if you see it clean it completely. It might work, it might not. My guess is, it's totally gone now.
Try this. Same thing happened to me last night. What happened was that I took the connector off the board while the phone was powered on. Go into recovery mode by pushing the Home Key and Power Button simultaneously. Once you hear the rings, it should turn on. Either that or you got a busted LCD.