I would follow what Dave recommended, but I am afraid the phone is shot. Water is one thing but sugar is entirely another.
Sorry to hear this. Might be best to think about the new phone coming out in a few months.
Hmmmm if it were me doing this I seriously would be stupid enough to drop it in water intentionally to take out the sugar and pray it works xD Lol. But yah orange juice or w/e juice fell on it is acidy, it's the iPhone's worst fear.