So I figured I'd clean the inside of the rear window of the new car (2015 GT Coupe). Now I know what real torture is. How in the world do you get down into the lower part and get everything clean? Not sure who designed it but they obviously don't own one. Any tricks or hints? Also, I tried Windex Ammonia and Invisible Glass and both were horrible. Anything good out there? Thanks..

 

I use Stoner's Invisible Glass in my detailing business.
Glass cleaning is all about technique. Here is a video about glass cleaning that may help you.

 

Here is another one by Larry Kosilla of Ammo NYC

 

If you're having trouble getting down into the corners, especially on the rear window, I've used a tool similar to the one in the link below.

http://www.homedepot.com/p/Stoner-In...5160/204999761