Portable Ultrasonic Cleaner

Ultrasonic cleaners exist for jewelry and glasses. I wanted to know whether a small one could wash clothes in a sink or a packable basin. So I ran staining and cleaning tests: stained fabric squares in two bowls of water, one with the cleaner running and one without, then laid the squares out on a tray to compare. It was the same question as the heated gear, whether technology that already existed for something else could be adapted to travel laundry, and it stayed on the bench for the same reasons.