The answer to 'tough stains on carpet cleaning' is that there are several common causes, including spills, pet accidents, and high-traffic areas. Symptoms may include discoloration, odors, and visible stains that are difficult to remove. Solutions can vary depending on the type of stain, but generally involve using the right cleaning products and techniques.
For tough stains, it's often best to call in a professional carpet cleaning service. They have the specialized equipment and expertise to effectively remove stubborn stains without damaging the carpet. DIY methods may work for lighter stains, but for deep-set or set-in stains, it's usually better to have a professional handle the job.