The answer to 'steam cleaner filthy' is that a steam cleaner can become dirty and ineffective over time due to a buildup of debris, hard water deposits, and detergent residue. Common symptoms include poor suction, weak steam output, and a foul odor from the machine.
To resolve this, you'll need to thoroughly clean and descale the steam cleaner. This involves disassembling the machine, removing the water tank, and scrubbing all internal components to remove any grime or mineral buildup. You may also need to run a vinegar or descaling solution through the machine to break down stubborn deposits. If the problem persists or you're not comfortable doing this yourself, it's best to call in a professional cleaning service to inspect and service the steam cleaner.