At Target I bought an OXO Swivel Scrub Brush to try for cleaning the back glass. It has a semi hard scrub pad on the end of a telescoping swivel wand. I used a microfiber towel folded in half over the pad. Spray the glass cleaner on the window and scrub away. Then replace the cleaning microfiber with a new microfiber and buff. No need to stretch and get twisted up like a pretzel anymore!!!!! It works really well and can take a fair amount of pressure without bending.
http://www.shopfosters.com/GOOD-GRIPS-Swivel-Scrub-Wand-p-1507.html
http://www.shopfosters.com/GOOD-GRIPS-Swivel-Scrub-Wand-p-1507.html