This is me giving the advice!
dd was on holiday with her school last week and on Thursday night she dropped her precious LG chocolate mobile in a glass of coke (full fat not diet.)
It worked initially but then not a dicky bird.
24 hours later she arrived home with her now deceased phone rather upset. We tried drying it out in the airing cupboard and putting it in a bag of rice to dry it out. Three days later it would not be revived.
It seemed really sticky. DH immersed it in a bowl of warm water (minus the sim card and the battery) and swooshed it round for about 20 secs and then shook it. It coughed and switched on for a while but then died again and could not be revived. We tried the drying out again but to no avail.
Last night it was sitting on the lounge table when I was on my laptop late last night. I casually picked it up and flicked the on button.
It sprung to life and has been working ever since!
Here endeth the lesson.