MOHAWK CARPET SAYS "Cleaning Recommendations Even with regular vacuuming, soil particles and oily dirt will cling to the carpet fibers. With foot traffic these particles and oily dirt are driven deep into the carpet. We recommend professional hot water extraction every 12 to 18 months. Periodic cleaning, using the hot water extraction method performed by a professional cleaner, will refresh carpet appearance.
The most used areas, such as entrances, doorways, traffic lanes, and in front of chairs will collect dirt faster than other areas. Clean these areas as they begin to show soil. This will stop dirt from spreading, and will extend the time between professional cleaning.