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Carpet cleaning..(carpet cleaners or owners please reply)? - rainbow carpet cleaners

I have heard that carpet cleaning can boot a bargain. I know the work involved. I wonder what the machine or franchises that are good to buy. I have Von Schrader Kwik Dry powder, dry, cool Oxi, Rainbow International, Coit, belongs OXI magic. I'm more interested in how good they are. What are some experiments with machines or companies. machines are getting the best.