As I recall durning WWII the navy washed prints on board ships using salt water and noticed that prints washed in salt water held up better than prints washed in tap water. The result was hypoclearning agent. When I lived in Southern Italy a block from the sea I washed fiber based prints in the ocean, but them in a mesh bag in a cove with not too much wave action and washed a couple of hours, 30 years later just fine. I did finish with a fresh water soak.