Sonic shower

• Hygenic device used in lieu of water bathing
  • Allows for resource conservation, avoiding the need to store large amounts of water
• Generates sonic pulse vibrations to dissolve dirt, dead skin, and other debris (VOY: "Juggernaut")
• Invented by 2260s (TOS Novel: The Captain's Oath)
• Handheld units serve similar fashion (DS9 Novel: Mission Gamma: This Gray Spirit)