#1: Which method of cleaning do they use?
Hot water extraction performed by a truck mounted unit is the method recommended by the world's largest carpet manufacturers. This method requires the largest investment from the cleaning company so it is a good indication that the company is serious about their business. When performed by a qualified technician, hot water extraction using a truck mounted system will give your carpet the deepest, healthiest cleaning possible.
#2: Are the technicians certified by the IICRC?
The Institute of Inspection, Cleaning and Restoration Certification (IICRC) is an independent body that provides the most complete technical training courses and seminars available to carpet cleaning and restoration professionals. IICRC Certification and Training is expensive so many companies cut corners when it comes to training their employees. Before agreeing to have your carpet or upholstery cleaned, you should ask to see written proof of the company's and the technician's IICRC certification.