The answer to 'steam cleaner grimy' is that a steam cleaner may become grimy due to a buildup of dirt, grime, and mineral deposits from the water used in the cleaning process. This can lead to decreased cleaning performance and potentially damage the machine over time.
Some common causes of a grimy steam cleaner include using hard water, not properly maintaining the machine, and not cleaning the internal components regularly. Symptoms may include decreased suction, water leaks, and a noticeable buildup of residue on the exterior of the machine.