I've done the same with my 3 Sonys and my S7 as soon as I got home from the store....never a problem. I do put the vacuum on low and suck out any residual water from the speaker grill and usb port.
If my S7 did fall into a chlorine pool or salt water, I would definately rinse it under the tap in fresh water and use the vacuum. In fact I wash mine with a tiny tiny bit of dish soap and good rinse if it gets dirty....had to get mustard off it once.