So, while checking the fluids, the rear windshield fluid dispenser somehow leaks INSIDE the rear window. I just did a quick look and didn't see an obvious dispenser anywhere. Is it on the wiper mechanism itself? If this is a common problem, is it easy to get to it?

 

The spray nozzle should be above the window on the metal part of the door (black plastic about 1x1x1 cm). It is possible that the hose came off inside. If that is the case, you can remove the internal plastic door parts to get to it.