Chosen Solution
I was at the beach near the shore and a wave hit me, getting only the top of my iPhone (power button and camera side) slightly wet. I dried it off, the screen went grey and flickered with some white squares, then the phone turned off. Then the phone started overheating, mostly near the top of the battery on the back side. It got really hot, past the point where it would give you the overheating warning and automatically shut off. I tried pressing some buttons but it was unresponsive, then I tried cooling it off with the AC in my car and after a while it stopped overheating. The side of the phone where the battery is smelled like melted metal. I came home and it’s been in rice for about 4 hours. Any ideas what I should do now?
If you believed putting it in rice would help, it’s basically done for. Rice does not help in any way, especially when you have salt water inside. The only right way is to open up the phone immediately, disconnect the battery and clean the board. Now the board is salt water contaminated and kept under power for such a long time, the corrosion could be spectacular. I would not recommend anyone without experience to repair it.