I live in San Diego and used Zero Rez because they advertised a better method for cleaning. Just hours after the truck left the same dirt spots came back. I called to have the company return to finish the job. Again, they claimed all was well and left. Just days later, the carpet looked like it did after all the other carpet cleaning "experts" came and left. The concept that their conditioned water makes a difference is hype and the results prove it is a myth.
Use DryCarpet.