From the Expert website: "Mistake #2: Choosing a carpet cleaner who isn't certified by the Institute of Inspection, Cleaning, and Restoration Certification (IICRC).
If your carpet cleaner isn't a close friend, you may not know whether they have the knowledge or experience to clean your carpet well. If you want to be sure you're hiring a competent professional, make sure they are IICRC certified. The carpet cleaner must earn that certification through study, experience, and the successful completion of formal, written examinations."
Just checked the IICRC locate a certified pro list for all cleaners within 50 miles of DC and Expert is not on the list. Now that is funny.