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Dramatic_Hammer
C-16 and c-24 graded timber (that is timber that has been graded and prepared for the construction industry) is tanalised. This means it has wood preservative applied to it at pressure so it soaks further into the wood than any surface applied preservative would do. Because of this it is very able to stand up to surface water and even repeated freeze/thaw cycles but the pressure washer will eventually erode the timber beyond the protection of the preservative meaning all moisture becomes an issue and the timber will rot fairly quickly.
FYI ALWAYS wash your hands after handling construction grade timber and wear a dust mask or have good dust extraction when cutting as some of the chemicals in the preservative are pretty unpleasant (arsenic / boron)