My friend accidentally forgot his phone in his pants and then washed the pants in the washer. He took it apart, dried everything with a blow dryer on low and put it back together. The phone didnt work when he turned it on, so he plugged it into the charger and removed the battery. Surprisingly, the phone worked. It was the battery that got messed up. Ended up buying a new battery for the phone and it worked great after that.
If you cant get it to work with the battery, try the phone without the battery but with the charger.