@AdamPWC Not sure how you may have resolved this topic, but it is back at the top of the forum feed, so I figured I’d chime in.
I have actually seen a few new recommended videos in my Youtube feed for using toilet bowl cleaner, either “The Works” or “Lysol Clinging Gel”. Apparently the acid in the product is very effective. The downside is that you have to wash it immediately otherwise risk surface etching.
Since your original post was about the higher level windows. Could you use a brass wool pad holder with a terry cloth or microfiber rag, doused in the toilet bowel cleaner, and then scrub the higher windows using your pole, then flip it around, turn the water on and scrub & rinse with pure water?