IPhone got damp and no longer charges

Last night, I accidentally dropped my iPhone 4 in the toilet. It's in a Griffin Survivor Case so I was relieved to find that it still functioned perfectly and that on removing the case was barely damp at all. I then continued to use it until it fuilly ran out of battery, then put it on to charge. All was going perfectly, charging normally, until it got to 18% when an error message popped up on my screen. Unfortunately I accidentally closed the message before I got a chance to look at it so I have no idea what it said. However, after the message appeared the phone stopped charging and had the "fully charged" little logo thing in the battery on the top right of the screen. I didn't think much of this and just left it overnight, hoping it would start charging again. In the morning, I used up the remaining 18%, but now when I try to charge it nothing happens whatsoever. The "conect to charger" logo still appears on the screen when I try to turn it on but nothing happens when I connect it to a charger. Any idea how, or if, I could fix this?

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