A sonic shower was a common hygiene device used in the United Federation of Planets. (TOS movie: Star Trek: The Motion Picture; TNG episode: "The Game"; DS9 episodes: "If Wishes Were Horses", "Wrongs Darker Than Death or Night", "Nor the Battle to the Strong", "Favor the Bold", "Extreme Measures", "The Siege of AR-558"; VOY episodes: "Juggernaut", "Day of Honor"; New Worlds, New Civilizations short story: "Tempered by the Forge")