The answer to 'pressure washer odor' is that a strong, unpleasant odor coming from your pressure washer is usually caused by a buildup of mold, mildew, or other organic matter in the machine. This can happen if the pressure washer is not properly cleaned and stored after each use. The odor may also be due to fuel or oil leaks.
To fix the issue, you'll need to thoroughly clean the pressure washer, including the pump, hoses, and nozzles. You can use a pressure washer cleaner or vinegar solution to disinfect the system. If the odor persists, it may indicate a more serious problem like a fuel or oil leak that will require professional repair.