Even if you use the right type of additive, washer jets can become clogged on occasion. Clearing them should be simple with an ordinary pin, but if this is only a temporary fix, the offending pipes should be removed from the jet and both the pipe and the jet thoroughly cleaned. It’s important to remember that if the ball pin unit is removed with a pin and the screwed type with a screwdriver, the water jet will hit the screen lower than the standmill.