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Just my experience.
The times I've used shampoo the least frequently have been when surfing / diving. It quickly became a matted sticky mess. Water didn't change that.
That said I probably didn't have access to a decent quantity of properly hot water, so maybe that plus short hair would have made a difference.
Also I don't agree that sea water is just salt + water. It totally depends where you are but sand, shit, ground plastic and plant matter are generally also present.
hugo7
sea water is just salt and water, it isn't some miraculous chemical soup*
as we all should know, salt is dissolved by water, more so by hot water, so why wouldn't a shower work to rinse the sea out
*unless you are swimming in a non blue flagged beach and have been bumping into dogs / human eggs and general effluent