Is the rear glass on the lift gate weak of soft? I noticed today that there are scratches all over the glass on the lift gate. I'm not talking about light scratches I can't feel, I'm talking about deep scratches I can feel. They can't be caused by the wiper because the scratches are also out of the path of the wiper. I never use those Squeegees at gas stations. I learned my lesson when a squeegee scratched the heck out of my windshield of my old S-10. When I wash the Acadia or have it washed I rinse all the lose dirt off. Then this past summer while towing a trailer a stone must have bounced off the trailer hit the rear glass and put a nice chip right in the middle of the glass. Does anyone else have this going on with your rear windows?