I took my elderly mother in law out in her 53 Focus for a quick spin, and on trying to use the rear screen washer it promptly squirted water out through the trim at the top of the rear screen and onto the parcel shelf. I don't want her to get ripped off at a Ford dealer, but on removing the trim it appears that the pipe runs inside the tailgate and I dont know where to start to try to find the leak. Any suggestions gratefully received!