1. If it's been more than an hour, the damage has been done. (The salts and other corrosives in the water have already started to destroy the phone.)
2. A phone isn't like a letter - you don't just open it. If you want to learn how to repair a phone, get a job in a repair shop or take a course in phone repair. Probably 75% or more of phones that the owner opens end up going to China to have the gold reclaimed (IOW, on the junk pile). The videos you see on Youtube are nice - but anyone who's actually worked on cellphones can see that the "this is the first phone I've ever opened" is a blatant lie. The fingers are talking a lot louder than the voice.