It was mentioned so much time in this forum, that I'm very surprised there are still people repeating the same mistakes all over again.

first thing - *never* ever try to turn it on, if You soaked it by accident... First thing to do ASAP is to remove battery. then, after drying it as much as You can with paper towels, disassemble it completely (it's not hard process, many youtube videos showing it etc), and put parts into bag of rice. Personally, I would left it for at least few hours there. Using hair dryer (after bag of rice) may be good idea also.

After that, left it for *few days* in dry, warm and *well ventilated* place. Yea, you heard correctly - leave parts for few days. You'll be on safe side, cause some moisture can still be left in very hard accessible places.

Then, it should be safe to put parts together, insert battery and turn on.

Of course risky people try to turn it on after few hours of drying, or even without taking it fully apart - just removing cover - it may work after that, even for months, but You're risking oxidization damage showing up after unspecified amount of time. I think you can left N900 in warm, dry and ventilated places, for sake of it's good health.