The answer to 'why is my steam cleaner stained' is that there are a few common causes, including mineral buildup, discolored water, and improper cleaning. Steam cleaners use hot water to clean, and over time, minerals and other contaminants can leave behind stains and residue in the tank and hoses.
The most common culprit is mineral buildup from hard water. As the water heats up, minerals like calcium and lime can leave behind a white or crusty stain. Discolored water, often from rust or other debris, can also stain the interior of the steam cleaner. Finally, if the steam cleaner isn't properly cleaned and maintained, leftover dirt and grime can cause staining.