The answer to 'tough stains on deep cleaning' is that there are several common causes for tough stains, including grease, red wine, ink, and ground-in dirt. Symptoms of tough stains include discoloration, set-in marks, and stains that resist regular cleaning. Solutions can include using specialized cleaning products, applying elbow grease, and calling in a professional cleaning service for the toughest stains.
When dealing with tough stains, it's best to start with DIY methods like pretreating the stain, scrubbing with a soft-bristle brush, and using an appropriate cleaning solution. However, if the stain persists or you're unsure of the best approach, it's often wise to call in a professional cleaning technician who has the tools and expertise to safely and effectively remove even the most stubborn stains.