[faderrific]

I had the exact same problem. I spent some time and cleaned out all my fluid lines going to the back and then lightly shot some compressed air through. Make sure you drain all the fluid in the reservoir before you do anything. You can get to the reservoir from within the passenger side wheel well behind the bumper. Just a few clips (use a flathead screwdriver).

In the back liftgate the hose is inside the plastic cover. There is a little black PLASTIC direction piece in there. For some reason (probably cheap fluid) it became all gunked up and blocked the final 18" of the hose before the motor.

I fixed the front washers by removing the under-hood sound dampener and disconnected the little sprayer, and sprayed some more compressed air through the hose.

Connected everything back up and all now works. I made sure to get the most expensive windshield wiper fluid I could find, all 3.99 of it. I was surprised that it took 2 big jugs and still had room in the reservoir.