"She washes the polar bear in the sea water" should be accepted.
So basically she washes it with sea water? Or in a pool filled with sea water? Or she starts washing it in a liquid from the sea and continues after having landed?
Whatever this means I didn't get it.
It only says that she washes it with sea water. It isn't specified where. Vandet fra havet = the water from the sea = the sea water.