My rear wash isn't spraying onto the glass, and I'm not entirely sure where to start the troubleshooting. The wash motor is making noise when I activate with the wiper stalk, but there isn't any spray. Sometimes I get a drop of water on the nozzles. I know with the B5 passat estate there is a little elbow joining at the rear left of the car under where the jack sits on that car, but I can't get access to there without (apparently) ripping up a lot of trim around there. What are the locations of hoses that I can trace to see where the blockage is? Should I take off the rear door trim first to see? Thanks!