I have a 2010 hhr and the other day I noticed that when I push the windshield washer spray button for my back windshield that I had the fluid come out my passenger side panel in the back inside panel of my car. I wasn't sure how to remove the big inside panel to take a look and see if it is tube that cracked or motor doing something weird. Thanks for your input!

 

The tube that supplies the fluid to the rear runs from the washer tank reservoir under the hood.
Logic follows where you see the fluid is in the vicinity of your leak.
To pop off panels a flat type pry tool is needed to pop or release the plastic hold downs.
Find a seam nearby and pry gently.
If something breaks the fastener is preferred as it is easier to replace than a panel.

Inexperienced? Have access to a pick and pull salvage yard? Go there and practice on your model exactly or the same manufacturer..
Bring the tools of destruction. Screwdrivers pry bars and the BAH.

I'm thinking the hose is cracked that feeds the back window nozzle.

Parts are parts. You don't have the wrong parts you have the wrong car! ????

 

The washer pump is mounted to the lower part of the washer fluid pump under the hood. Two lines leave the pump. One goes to the windshield wipers and the other goes to the rear window. Start tracing for leaks at the pump.