What you should not do:
Experts have for years pointed out that’s a bad idea – and now Apple is officially warning users not to do it.
“Don’t put your iPhone in a bag of rice. Doing so could allow small particles of rice to damage your iPhone,” the company says in a recent support note spotted by Macworld. Along with the risk of damage, testing has suggested uncooked rice is not particularly effective at drying the device.
What you should do:
If your phone isn’t functioning at all, turn it off right away and don’t press any buttons. The next steps depend on your specific circumstances, but broadly speaking: dry it with a towel and put it in an airtight container packed with silica packets if you have them. Don’t charge it until you’re sure it’s dry.
I found if the car is nearby, place the wet phone over the windscreen de-mister vent and then run the aircon through that vent. Doesn't have to be hot air to dry it as long as the compressor for the aircon is running... Aircon dries out the air before blowing it through the cabin so you will have bone dry air circulating around the phone pulling the moisture out by evaporation. About 10 mins is plenty. Best done idling in the shade. Don't want to sun damage the phone while trying dry it out...