I've never used soap and water, but I'll give it a try, thanks.
It works great in the Ultrasonic cleaners. I just cleaned a two barrel Nikki today that looked like it had been in a pig pen. Now it looks like a brand new carburetor. I use A tablespoon of Daen Platinum in about 9 liters of water. Now of course I had to change it out to plain water for second run as the water was so dirty.