The answer to 'my pressure washer is filthy' is that a dirty pressure washer is a common issue caused by a buildup of dirt, debris, and residue from regular use. Symptoms include decreased cleaning power, clogged nozzles, and reduced water flow. To solve this, you'll need to thoroughly clean and maintain your pressure washer.
Start by disconnecting the pressure washer from the power source and water supply. Then, use a soft-bristle brush and a mild detergent solution to scrub the exterior of the unit, paying close attention to the nozzle, wand, and any other removable parts. Rinse thoroughly with clean water. You may also need to soak the nozzle in a vinegar or chemical cleaner to remove any stubborn buildup. Once everything is clean, reassemble the pressure washer and test it to ensure it's working properly.