Clean Car Windows

I've been detailing cars for over 40 years now, and I've gotten pretty good at it. But, there are a couple tasks that really test my skills. The main one is getting the windows perfect. It usually takes a couple try's to get them as clean as I like.
Finally, after years of trying every method I've ever heard of, I have it down to a system that works for me. First of all, the car has to be generally clean to begin with. You want to finish any, waxing, tire treatment, or other such tasks that you might be doing. The windows should be the last step.
I like to use a good quality glass cleaner, paper towels, and a nice soft cloth. I start by using the spray cleaner, and paper towels, to get off any bug residue, or other such contamination, followed immediately by buffing over the cleaned section with the cloth. Move on to the next section, and repeat the process. The cloth really helps to eliminate any streaks left by the paper towels.
I usually start with the windshield, doing the outside first, then moving to the inside. When finished with the inside, it will be easy to tell how good you did on the outside. Sometimes I have to go back and do the outside again to get it just right. ( I have very high standards when it comes to how clean my cars are). When the windshield is good, continue the process with each of the side windows, and the rear window. It's only taken a lifetime of practice, but I can usually get the car windows pretty clean now.

The Shelby in Southwest Utah, clean windows and all.