I have a Nikon 150mm lens which I did one of those amazingly dumb things and let it and my camera fall into a creek when I was backpacking a couple of weeks ago. The lens was underwater for a couple of seconds and I now know firsthand that shutters are not waterproof.
I unscrewed the lens elements and dried them with a lens cloth and when I moved the shutter speed dial, it sounded bad, so I put the lens away and didn't use it the rest of the trip.
I took the lens to get a CLA as soon as I got home and it looks like the shutter will be OK.
Is there any thing I could/should have done to the shutter immediately after retrieving it from the water to increase its chance of survival?