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 tests on stained and dirt-packed fabric squares. I also tested spray-on repellents like Nanoman, protectME and RepelWell to see how they held up under real-world conditions, and even clothes billed as stain-proof, like Ably and Western Rise. None of them held up in my testing, so the idea stayed on the bench.