Carpet cleaning should be used as a measure of maintenance, not just a spot specific cleaning. Your carpet is relatively dirty all the time. From dirt blowing through open windows and doors, to debris tracked in quietly each day by your family or pets. Your carpet becomes dirty in such small increments that you can’t truly tell how dirty it is today compared to yesterday. Allowing your carpet to go for extensive periods of time without be properly cleaned, cuts its life down several years. Professional carpet cleaning should be scheduled once a year at the very minimum. Two to three times a year is best, and even more if you have heavy traffic in your home or business. Carpet cleaning prices are calculated per room size.