Rear washer jet leak - X3
Hi - the rear jet/hose is hidden behind the plastic trim that is fitteed all around the inside of the rear window. You need to prise off the trim carefully on the left hand side / top left corner to reveal the pipe and jet. I used a screwdriver to do this- be careful not to prise too hard as you can easily damage the plastic trim or snap the connectors off.
I didn't have to remove any carpet as my leak was near the jet at the back of the car. (In my case, the jet had simply frozen up in the cold weather and the ice had expanded and pushed the jet off the pipe.)
Removing the rear trim is very fiddly, it took me several hours to do it but once you have removed the trim you will see the pipe and jet and then its easy to reconnect.