J.
there are two things that I do when I clean windows, and I have done plenty. First, clean the window/glass with soapy water and then squeege it off. Then use the windex to shine the spots left behind. That is all it was meant to do anyway. The trick is the old one, to used newspaper, black and white, to dry with when you have sprayed the windex. This will make your hands turn black. If the cloud it on the inside they may have soap scum that has built up and need to be cleaned with a different cleaner. Like tilex soap scum.
W. M.