I liked the Windex Outdoor All-In-One Window Cleaner.  I used it on my upstairs windows.  They are side to side sliders, but only one half slides.  The other half is fixed iin place.  The sliding half is easy - pop out the window and clean it inside and out.  The fixed 1/2 in a pain!  I used the cleaner to reach out and clean the outside window surface.  They were really dirty!  The Outdoor All-In-One Window Cleaner did a great job of cleaning.  I rinsed, but when the first one dried, I had spots.  Not bad - just a few - but I am really fussy about the windows!  So I washed again , rinsed...