Supposedly there are saddle covers made by Velox that are really good for Brooks saddles.
My Team Pro got a really good soaking, I mean, shoes full, shorts squishing, I was drenched! And well, liking it since we bikers are wierd, but that's beside the point. When I got home I gave the bike a good rinsing with fresh water since it was wet anyway, and better to get the dirt off while it's loose. I just let the bike, and saddle, dry, and put some Proofide on the top surface of the saddle when it was dry. No deformation or change in shape of any kind, you can't even tell it was ever wet.