Eighty percent of the dirt on a carpet comes from the soles of our shoes, according to Fabrica Fine Carpet & Rugs. Carpets don't usually wear out; they become dirty and unattractive. When you have carpets professionally cleaned, the cleaning is typically done by a carpet cleaning technician. It can be helpful for a carpet cleaning technician to have a GED or high school diploma, but it's usually not required, especially if the technician has experience cleaning carpets. According to the U.S. Bureau of Labor Statistics, employment for this and similar jobs will grow at a rate of about 11 percent through 2020.