We switched to Ultra 3 detergent after using Dawn detergent for years. A quantum leap in effectiveness. When we got the new Ultra 2100 cabinet ultrasonic unit it came with a gallon of detergent. We used it ONE TIME and the parts came out so much cleaner, almost brand new. The detergent is expensive, yet we've never gone back.
via u/palump at Bremerton Typewriter
Ultra 3 Detergent: https://shop.ultrasonicllc.com/collections/ultrasonic-cleaning-solutions/products/ultra-3-multi-purpose-ultrasonic-detergent