First off Rice is for cooking and wont dry anything. its a tv thing. Start by taking the phone apart.Clean ever connection with a soft toothbrush. As well clean the logic board use a 99% isopropal alcohol for all cleaning. now is the time to start drying out the phone. Set the screen in a desiccant or silica gel leave it in for several day moving it from time to time to get the max effect from the desiccant . use a blow dryer on a low heat setting to dry the rest of the phone. Only use a hair dryer once you have cleaned the phone completely with the alcohol. Do not attempt to dry the phone if its still wet with water with the blow dryer as this only spreds the water. Replace the battery with a new one consider the old ones done. a battery is never right after it gets wet. Clean again with isopropal alcohol let dry and when you think everything is clean and dry reassemble the phone (make sure to clean the contacts on the screen after removing from the desiccant). Once you've reassembled the phone its time to power it on. Hold your breath and hope for the best
https://www.youtube.com/watch?v=Y9LMvSK2pJI
this shows how to get into the phone but you need to go farther and take everything apart you need to clean both sides of the motherboard. take your time when taking it apart keep your parts in order so you know where they go back to and make sure you put screws in right order .