The answer to 'pressure washing smells bad' is that a foul odor from pressure washing is often caused by mold, mildew, or organic matter being dislodged and released during the cleaning process. This is a common issue, especially when washing surfaces that have not been properly maintained or cleaned in a long time.
The smell can be unpleasant, but it is typically not a sign of a serious problem. It's usually just the result of the pressure washer lifting up grime, dirt, and microorganisms that have built up over time. To address the smell, make sure to thoroughly rinse the surface after pressure washing and allow it to fully dry. You may also want to consider using a cleaning solution with a deodorizing agent to help neutralize odors.