The answer to 'steam cleaner odor' is that there are several common causes, including leftover dirty water, mold or mildew buildup, and chemical residues. Symptoms may include a musty, stale, or chemical-like smell coming from the steam cleaner.
To troubleshoot and fix steam cleaner odors, start by thoroughly cleaning and drying the machine after each use. Avoid leaving dirty water sitting in the tank. Check for any mold or mildew growth and clean it out. You may also need to descale the machine or replace the water filters. If the odor persists, it could be a sign of a more serious issue that may require calling a professional cleaning service technician.