Well, i drove to guest's solihull yestarday (an hour round trip, but my nearest dealer), they fixed my washers " a cable come loose and we replaced a jet", on the way home to my immense rage, they stoppped working again. I Stopped off at Tescos (New years eve goodies
), returning to my car i tried ZF advice, near the bottle and visible is a pipe joint, i removed the cable and applied a burst, to which water jetison'd from the pipe, i tried to blow on the pipe leading to the jets, but there was no give. I replace the cable, and then hey presto it worked again????
later on in the day, driving to NYE party, it stopped working again, then 1 worked fully (the drivers side), and one didnt
Perhaps the cleaning advice was a good tip?