I haven't used this one, but even Mr.Pink and Citrus Gloss doesn't really take much off with a foam gun. Most of the dirt will still be there and require a proper hand wash. So I'm really not surprised by this result. What soaps can work in a foam gun to do touchless anyway? To me if your using a pressure washer it would be more likely the pressure of the water doing most of the work, where a foam gun doesn't have enough pressure to do much. So the soap would have to be awfully special to actually aid in removing actual dirt. I'd be curious to know of a soap capable of doing that with a foam gun.