The answer to 'why is my pressure washer pet stains' is that pet stains can be difficult to remove with a pressure washer alone. Pet urine, feces, and other organic matter can soak into porous surfaces like concrete or pavement, making it challenging to fully clean with just high-pressure water.
The combination of the pressure washer's force and the chemical composition of pet stains often requires additional cleaning solutions and techniques to effectively break down and remove the stains. Without the right approach, pressure washing alone may just spread the stain around or drive it deeper into the surface.