They're crazy. I was so skeptical at first but the results were far beyond what I expected. Seeing the tendrils of gunk and ooze spiraling up off the parts the second we hit "start" on the cleaner was amazing. We just used Dawn dish soap and it did a great job.Looking good! Ultrasonic cleaners are (IMO) basically essential to properly rebuild a carb. Simple Green & water makes for a great cleaning solution.