The answer to 'why is my steam cleaner dusty' is that a dusty steam cleaner is usually caused by a dirty water tank or filter. Over time, debris and minerals can build up in the tank and filter, leading to a dusty or dirty exhaust. This can reduce the cleaning performance and efficiency of your steam cleaner.
To fix a dusty steam cleaner, you'll want to regularly clean the water tank and replace the filter according to the manufacturer's instructions. This will help remove any built-up grime and keep your steam cleaner working at its best. If the problem persists, you may need to have the steam cleaner serviced by a professional cleaning technician.