I was searching on the web for something that would clean and restore my rear window as it was very hazy and hard to see out of.
This stuff really works.
I spent about 40 minutes on my rear window, following the instructions, and it came out looking 100% better -- almost looks new aside from some deep scratches that this product will not remove:
http://www.youtube.com/watch?v=uiBIzMS4Png
Photos of my actual rear window, before and after:
Before:

After:
