Of course you got to use some soap as you got to break the chemical bonds. I am using Alcojet 12.5 pH soap 2 tablespoons per 10 liters. The results you see at 240 watts for 30 minutes.
Now that air compressor next time try adding bleach to the water. You be surprised at how much it cleans just sitting over night. I use that method of cleaning on hair combs and brushes to clean them for years before I got the UC.
