The answer to 'why is my pressure washer grimy' is that a grimy pressure washer is often caused by a buildup of dirt, grime, and residue from repeated use. This can happen over time as the washer is used to clean various surfaces and materials, leading to a gradual accumulation of debris inside the machine.
Some common symptoms of a grimy pressure washer include reduced water pressure, decreased cleaning power, and visible dirt or grime inside the hoses, wands, or other components. To fix this, you'll need to thoroughly clean and maintain the pressure washer on a regular basis to prevent buildup and keep it operating at peak performance.