I went on a Chemdry business seminar quite a few years ago (20) actually they demonstrated there carpet cleaning system, at that time they used what looked like a pump up gloria sprayer with a c02 charging system on the side, they said it was the bubbles in the carbonation that forced the dirt to the surface when appled to the carpet, then they used a bonnet machine to extract it !
They also used the theory of the straw in a tumbler of lemonade that the bubbles (carbonation) that lifts the straw, also lifts the soil from the carpet. But that was then, 1995 and I am sure CD have come on a fair bit since then! As we all have, they dont have a very good reputation where I live in the cleveland area as my clients have generally used them at some point before using me, I know Jason had a CD franchise not far from where I lived but think he was in the restoration business so thing that
CD do very well from
Stuart