Frequently used carpet should be professionally cleaned by a qualified technician at least annually - perhaps a little longer interval for infrequently used carpet and even sooner for carpet in homes occupied by respiratory sensitive or allergic persons; or in homes with indoor pets.The following chart from the IICRC S100 Standard and Reference Guide for Moore's Carpet Care serves as a guideline for recommending cleaning frequencies for carpet. We consider traffic, soil rating, vacuuming schedules, spot cleaning schedules, and professional interim and restorative cleaning.
Residential Carpet Cleaning Frequency Chart