Foaming Carpet Cleaner

There is a lot of "how to" on the web about mixing your own carpet cleaning solutions. I like the

foaming stuff in spray cans. Obviously, the compressed liquid becomes a foam as it exits the

valve and the pressure drops.



I've got one quart, two quart, one gallon, and two gallon tank sprayers. Is there any combination

of chemicals I can mix in a tank sprayer that is similar to the foaming product from spray cans?