Sea salt solution
In that hour it dries your hair out just enough. Salt draws water and moisture out of your hair. But if you leave it in too long it'll draw moisture out of your scalp as well. and if you leave it in continuously, it'll just keep drying out your scalp until it starts to itchuncontrollably. Salt doesn'tdissolve in oil. So the oil that your scalp produces wont dissolve the salt. it'll just stay there until you wash it next. This will make your hair brittle and your scalp raw.
That hour or 2 draws enough moisture out of your hair to dry it out enough to make it more ready to tangle without damaging it.