The IICRC stands for Institute of Inspection, Cleaning, and Restoration Certification. It is the professional organization that all reputable carpet cleaners are members. It is not only the largest carpet cleaning organization of professionals it is the most recognized. The IICRC requires certifications from all its members, technicians, and owners and continual education courses must be attended yearly in order to maintain a firms certification.
From their website: The Institute of Inspection, Cleaning and Restoration Certification (IICRC) has served as the Industry Guardian for the cleaning, inspection and restoration service industries for more than 30 years. As a non-profit certification organization, the IICRC helps ensure that you have access to trusted and trained cleaning professionals by establishing and monitoring certification programs and standards for these industries.
To qualify for IICRC-Certified Firm status businesses must demonstrate proof of insurance, maintain a written customer complaint policy with documented follow-up and provide ongoing education and training leading to certification for all technicians. IICRC Certified Firms are also required to abide by the IICRC Code of Ethics. Services provided by IICRC–Certified professionals range from flooring inspection and cleaning to mold remediation to water and fire damage restoration.