Yes you are all right about what the true meaning of a help forum is ....... Please forgive me for trying to Capitalize on the solution for the problem.
The problem: I found the problem with the wiper system is that when the wiper is turned off it gets parked into the shoe on the backdoor. In the parked position the spring tensioned hinge joint near the pivot shaft will be slightly pushed out, after a period of time that hinged joint sticks from corrosion and the spring is unable to overcome the the binding so the spring cannot pull the wiper back against the window.
The corrective fix: Remove the pivot shaft nut from the base of the wiper arm (some models have a plastic cover that will have to be swung out of the way to get at the nut) and remove the wiper arm from the motor shaft. Next pull off the wiper wash tube from the fitting on the hatch. Then you will need to lubricate the hinge joint with a good penetrating oil and work the hinge joint back and forth until you get good full motion of the hinge joint. Next reinstall the wiper arm assuring that the wiper gets properly parked in the shoe, tighten the nut and check it out. You may have to do some re-bending of the arm because I'm sure that everyone with this problem has tried bending the arm in one way or another to get it to conform to to window. I HAVE