Set Aluminum Slider

I own a cleaning company, and everytime I clean a particular set of units, I'm asked if I clean sliding glass doors. My answer is aways, "yes". These sliders are anywhere from 12 inches to 6 inches from a screened enclosure. So I have two choices. One: Remove all screens, clean the glass, then replace the screen. Not feasible. The other is to use a squeegee on a pole to get back there. Except the angle of the blade is too shallow. There are squeegee handles out there that will swivel, but the pivot point it too far away, so the handle, or the squeegee it the aluminum which holds the screen. The squeegee I have is ok, but the angle is so shallow that the metal is actually touching and scraping the glass. I have searched high and low. I bought a Sorbo squeegee, it is tough. It has it's place in my arsenal of weapons, but not for this job. Any suggestions?