Why wont it turn on?

When a phone comes in contact with water you cannot get rid of the damage unless you have taken the phone apart. When the phone is in use the water travels faster (it's kinda like Osmosis) so this will take the water through the motherboard. Then the heat and working of the electronics/components in the phone causes it to corrode the motherboard so if you were to open up the phone it would look kind of like green moss around the connections and it can also cause the phone to lose the use of components and lose solder which obviously is not what you want. The rice and hair dryer tricks are always used but usually don't work.

If you want to restore the life of the battery you'll need the following (along with the necessary tools):

1.New battery.

2.Toothbrush.

3.Isopropyl Alcohol.

4.Goggles.

5.Nose and mouth mask.

6.Latex/Plastic Gloves.

7.Eraser.

Strip the phone and take out the motherboard. Using gloves and goggles and possibly a mask (Isopropyl is very bad when breathed in especially for your lungs). Dip the toothbrush in Isopropyl Alcohol and clean the board with it taking away all of the corrosion. On the gold contact plates on the board use the eraser to get the dirt/corrosion off them do not use the toothbrush as it could scratch and cause damage. Hopefully if all goes well this should work you may also need to reflow the motherboard to set everything again. There will most probably be parts that need changing but you'll know that when the device is on. After you've cleaned it wait 20-30 minutes for the board to dry (it needs to be completely dry otherwise this could cause damage). Check the board for any black bits that should be gold and try soldering them (if this isn't up your street take it in to a technician). Hope this helps, any questions I'll answer. Use this guide in order to strip the phone.