we've just cleaned all the windows, inside and out, for the first time in 2 years, as our window cleaner stopped coming. i used to use windowlene spray, but have found the easiest and quickest way, with all the windows we've had to do, is either a bit of fairy or a bit of flash in a bucket of warm water, to wash them with a 'j' cloth. then a leather to dry them and shine them up. don't know why it's taken me so long to find out!! i would never, ever go back to the spray-on cleaner, too much like hard work.