Late to the party, but:
After 20 minutes of having water forced through every crevice in the device, with alkaline water (detergent), the odds of saving a phone, even if you could pull the battery, are slim. Dropping it into a hot tub isn't nearly as bad (although the chlorine doesn't help) because there's not that much agitation and/or dirt.
I usually recommend plain old rubbing alcohol, because a few bottles of it are cheap and you can get it almost anywhere, but deionized water (or triple-distilled water) is almost as good. About the only difference is that alcohol is hygroscopic, so 5 minutes in air after an alcohol bath is about the same as a week in silica gel or rice after a water bath. (And if the water isn't absolutely pure, just almost pure, it'll cause as much damage as tap water. (You can't always believe purity claims on labels unless the product is tightly controlled by law.) Alcohol isn't water (well ... 70% alcohol is about 30% water, but it's still hygroscopic), so even it it's only 69% alcohol it'll work.
But removing the battery in a tablet is the problem - you'd have to break the back of the case off pretty quickly to get to the battery plug, which is one reason I won't buy a phone that doesn't have a removable battery.
As far as Samsung's build quality, I'd put even a Nextel i530 against anything Samsung makes (and it's possible to damage an i530 if you know how). The candy bar version was impossible to damage. (I never owned a tracked vehicle - like a tank - so that could be a bit of an exaggeration, but not by much.) But throwing it against a steel wall wouldn't damage it and dropping it into the ocean didn't cause any problem that a rag or tissue wouldn't cure. Water resistant? Don't go swimming with an S5.