Scott, may I ask how do you clean your window towels, detergent wise, any fabric softener?
When I have problematic windows I usually use one window towel and one diaper, I also spray the window towel directly and not the window, I also like to not use a lot of product. After I clean all my windows then I follow up with my diaper and buff of any residue that is left behind and poof you will have crystal clear windows and you can thank me later!