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How often should I clean my carpets?

The IICRC created this chart as a guide for how often to clean your carpets

IICRC S100 STANDARD AND REFERENCE GUIDE FOR PROFESSIONAL CARPET CLEANING

The following chart from the IICRC S100 Standard and Reference Guide for Professional Carpet Cleaning serves as a guideline for recommending cleaning frequencies for carpet. They consider traffic, soil rating, vacuuming schedules, spot cleaning schedules, and professional interim and restorative cleaning.

RESIDENTIAL CARPET CLEANING FREQUENCY CHART

Traffic-Soil Rating Carpet Owner / Maintainer Professional Carpet Cleaner / Restorer
  Vacuuming Spot Cleaning Heavy-Use Area Cleaning Restorative Cleaning
Light Soil 1x per week Daily or as soon as spots are noticed Traffic areas every 12 to 18 months Every 2 years or per manufacturer warranty
Normal Soil ( families with children / elderly ) 1 to 2x per week Daily or as soon as spots are noticed Traffic areas every 6 to 12 months Annually
Heavy Soil ( families with pets / smoking ) 2 to 4x per week Daily or as soon as spots are noticed Traffic areas every 3 to 6 months Semi-Annually (2x per year)
Extreme Conditions ( large families / multiple pets ) Daily Daily or as soon as spots are noticed Traffic lanes every 2 to 3 months Quarterly (4x per year)

Source: IICRC S100 Standard and Reference Guide to Professional Carpet Cleaning.