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A sonic shower, also known as a sonic, was a piece of technology that was used for personal hygiene.
The sonic shower was faster and more efficient than water-based showers. It used ultrasonic vibrations to cause dirt and grime to simply vibrate/evaporate off a person's body, leaving it fresh and clean. Sonic showers were often found in refreshers. At Republic Mobile Surgical Units, staff members such as Jos Vondar and Barriss Offee had their own private sonic showers—and possibly refreshers—in their personal quarters. 
- Star Wars: The Old Republic: Shadow of Revan (Mentioned only)
- MedStar I: Battle Surgeons
- MedStar II: Jedi Healer
- Coruscant Nights I: Jedi Twilight (as ultrasonic shower)
- Coruscant Nights III: Patterns of Force (Mentioned only)
- Death Star
- Galaxy of Fear: The Swarm
- "Two for One"—Star Wars Adventure Journal 15 (Mentioned only)
- Young Jedi Knights: Return to Ord Mantell (First appearance)
- The New Jedi Order: The Unifying Force
- Death Star Technical Companion
- Galaxy Guide 7: Mos Eisley
- Star Wars Technical Journal, Volume One
- Death Star Technical Companion, Second Edition
- Star Wars Technical Journal
- Millennium Falcon Owners' Workshop Manual