My suggestion: find a tutorial on how to take it apart. Do that, stick the parts in rice for a few hours (overnight, perhaps), give them a good cleaning after retrieving them from the rice, and put it back together. (or find someone who might be more comfortable taking things apart, if you're like me and afraid of irreplaceable damage).
We took most of those steps with my wife's old phone. She accidentally left it in her pocket as we went swimming. It was submerged maybe five minutes, but long enough for water damage to set in. After discovering what happened, we immediately took it apart, and set the parts in rice.. Long story short: the next day, after much cleaning and rice removal, it turned back on. There was some water damage on the screen, but the phone was still functional. We were able to retrieve phone book and pictures. She probably could have still used it, but we had already ordered the upgrade. It was past time for an upgrade anyway, but I digress..