Hmmm... I've been a component level electronics technician for almost 25 years, 2 way radios, cell fones, pagers, etc. I say put it in the oven like I've done for a long time.
Besides, he doesn't have a lot to lose, it's probably trashed anyway.
It might dry out for you but chances are your cellphone is beached and now only good as a paper weight.
My daughter had her's in her pocket last summer and was pushed into a pool which, ofcourse, got it nice and wet - phone was garbage afterwards as it was probably powered on when it hit the water and just fried.
Good luck with it.
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