A few days ago my rear wiper started wiping on its own and wouldn't stop whenever I turned them on and off. Also the sprayer was also near non existent. After opening the boot I found water leaking from inside the boot door lid plastics. Eventually i removed the fuse to stop it going off on its own. I have just tried taking it apart to find the fault. well after heaving the inside plastic off the inside of the boot door ( with help from the old man as by god that's on there tight!) to discover it very damp inside and it was dripping from here I then opened up the metal cover on the unit to find something I was not expecting.... It's completely clogged up with a greasy mud. What the hell is that and whys it there? I cleaned would I could quickly and put it back together as I've run out of day light. Connected everything back up and it starts going off in its own again and then stops at a random location on the widow each time. It's does not work when I push the stalk in the cabin and not does the water jet work. I'm guessing a new unit is required? Can anyone advise on what's happened here?