The answer to 'carpet cleaning dirty' is that there are several common causes for dirty carpets, including high foot traffic, spills, pet accidents, and general wear and tear over time. Symptoms can include visible stains, matted or compressed fibers, and a dull or discolored appearance. There are both DIY and professional solutions available, depending on the severity of the problem.
For minor spills or light soiling, DIY carpet cleaning with a rented machine or spot cleaner may be sufficient. However, for more extensive dirt, deep-set stains, or overall poor carpet condition, it's best to hire a professional carpet cleaning service. They have the specialized equipment, cleaning solutions, and expertise to thoroughly clean and restore your carpets to like-new condition.