The answer to 'pressure washer discolored' is that discoloration on the surface after using a pressure washer is usually caused by mineral deposits or oxidation. This can happen if the water used in the pressure washer has high mineral content or if the surface being cleaned has rust or other metal particles that get stirred up during the washing process.
The discoloration may appear as white, yellow, or brown spots or streaks on the surface. This is typically not a sign of a deeper problem with the pressure washer itself, but rather an issue with the water quality or the surface being cleaned.