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The sonic shower was a technology that used sonic pulse vibrations to remove dirt and grime, contaminants and possibly dead skin from a humanoid body.
In an early revision of the final draft script of "Extreme Measures" (when the episode was titled "Night Tremors"), the detail that Ezri Dax's sonic shower was going to be fixed by O'Brien was not present. In its place was a reference to a similarly abandoned plan for Dax and O'Brien to have met at Deep Space 9's Replimat for a raktajino.
In 2376, Seven of Nine canceled a singing lesson with Neelix because she felt that his vocal cords were incapable of producing basic diatonic tones and he had other rhythmic shortcomings. Neelix complained that he sounded good in the sonic shower, and Seven suggested he confine his efforts to that location. (VOY: "Pathfinder")