Ok thanks. It was only once (by me, previous owner, not sure). When I got it, I took the crank off the bike to clean it and the shaft in the bottom bracket wasn't rusted so I doubt he went through much deep water...

FBinNY, it's water on the trail and that particular trail is about 100m from the road so I doubt there is much salt (from the road) in it. The bike is in the heated garage right now. I wiped it clean when I got home.

Thanks all.