I would have to disagree with this scenario in that something like that happening would have to be pretty uncommon, for one it is already fairly uncommon for the average person to ever pop the hood and pressure wash the engine compartment also that the vent line and solenoid are a vacuum system therefore being air-tight and it would make sense that it would also water tight to a certain extent, with the exception if water was aimed just right MAYBE a pretty minute amount could potentially enter the tube, given the solenoid is under the engine cover and under a large portion of the wring harness