It may be toast. I dropped my old iphone 4 in dish water. Immediately pulled it apart, removed the battery and dried everything I could. I then got a bowl big enough to hold the phone in about the middle, then poured rice in the bottom, put the open phone in and covered it with the rice.(I used brown I guess any kid would work) I left it in there overnight and then put it back together. Who knows it may just work, it did for me that phone still works and that was 4-5 years ago. I know not a technical answer but I got lucky!