I accidentally washed my iPhone 5. I put it in with a bag of rice but after 48 hours there was still water in it. I opened up a silica gel pack that comes in most product boxes and dumped the powder into a different bag. I put my iPhone in with it (do not let it touch the powder) and closed the bag. 12 hours later it was completely dry. Silica works MUCH faster than rice.
It is very important to NOT PLUG YOUR PHONE INTO ANYTHING until it's dry or you will fry the processor.
I also found that Apple put in a special fail safe in case you get the phone wet. Once a sensor detects moisture, it shuts the phone off. Pushing the power button will not turn it back on - this is to keep you from frying the phone. It will only turn back on when you plug it in.
You do realize that you are helping someone whose phone got wet 4 years ago?