Lapis
What I have done, is use vegetable grade dish soap (Natureclean) in a commercial unit.
Make sure to run water through the unit a few times to clean the chemicals out of the pump before you begin.
Then after I have cleansed the carpet, I do one more light rinse with
Colloidal Silver in the water so that a silver residue is left behind so mold and bacteria will be inhibited from growing.
~Lapis~