My 850 has just recently developed a problem with the screen washers, if I squirt the screen and release the column stalk it just keeps on squirting (4 miles worth!). removing the fuse is a temporary cure but clearly not practical. Last time it stuck on I took the fuse out and then disconnected the column stalk, put the fuse back in it still kept squirting. I assume this is a relay problem, any idea where the relay is and a part number to change it? Many Thanks