The answer to 'pressure washer odor' is that a smelly pressure washer is usually caused by stagnant water or built-up debris in the machine. This can lead to a foul, musty smell that can be unpleasant and even unsafe to use. The most common causes are leaving water in the machine after use, not properly cleaning the nozzle and wand, or not maintaining the pump and engine.
To fix a smelly pressure washer, you'll want to start by thoroughly cleaning and drying all the components, including the nozzle, wand, hose, and pump. Make sure to run a cleaning solution through the system and let it fully dry before storing. If the odor persists, you may need to replace worn seals or other internal parts. For serious issues or if you're uncomfortable working on the machine, it's best to call in a professional pressure washer repair technician.