The answer to 'my steam cleaner is filthy' is that a dirty steam cleaner is a common issue that can be caused by a buildup of dirt, grime, and mineral deposits from regular use. Symptoms may include decreased cleaning performance, leaks, or a foul odor coming from the machine.
Some common solutions include descaling the machine, cleaning the exterior and interior components, and replacing any worn or damaged parts. For a thorough cleaning, it's generally recommended to follow the manufacturer's instructions or to have a professional service the machine.