The answer to 'why is my steam cleaner grimy' is that a grimy steam cleaner is often caused by a buildup of dirt, grime, and mineral deposits from the water used in the machine. This can happen over time as the steam cleaner is used, especially if you're using tap water instead of distilled or purified water.
Some common symptoms of a grimy steam cleaner include water leaks, poor suction, and a dirty, discolored cleaning head. To fix this, you'll need to clean and descale the machine regularly. This involves running a cleaning solution through the system, scrubbing the components, and flushing out any built-up deposits.