Bevendre

Many do enjoy swimming or relaxing in bodies of water, but that is more for relaxation than bathing.

Because their hide is chitinous and rather hard it is not easy for dirt or grime to stick, nor can many parasites penetrate it.  The fire a changeling produces when it shifts shape is not only not merely for aesthetics, but burns just hot enough to purge a changeling of most issues as far as cleanliness goes.