The answer to 'tough stains on steam cleaner' is that there are several common causes, including built-up dirt, grease, or soap residue, as well as improper cleaning techniques. Symptoms may include streaking, discoloration, or failure to remove stains effectively. Solutions can involve using the right cleaning solutions, adjusting water temperature and pressure, and thoroughly cleaning the steam cleaner components.
If DIY efforts don't resolve the issue, it's often best to call a professional steam cleaning service. They have the expertise and equipment to deeply clean the steam cleaner and address more stubborn stains.