There's a very interesting article -- about cleaning windows -- that originated from Readers Digest Magazine. It's called "8 Clever Solutions for Cleaning Windows" and it addresses not just cleaning windows, but other items associated with windows -- like blinds, screens, shades and window sills. Some of the tips seem to be more just common sense, but I admit, they're ones I didn't think of. Windows becoming dirty again too soon after cleaning them? Tip #6 says to clean the furnace or AC filter -- that's likely the problem. Tip #4 is interesting -- to help keep your exterior window stay cleaner longer, apply a coating of floor wax. Tip #1 addresses the fundamental issue -- how to clean window glass and avoid streaking. In a way, this is common sense, too. What do window cleaning professionals use when they clean glass? A squeegee, of course. The tip is to "use a window-washing squeegee with a smooth, soft rubber edge." And it states not to clean glass in direct sunlight because quickly drying glass is more susceptible to streaking. The complete article -- including the other five "clever solutions"' can be found at http://shine.yahoo.com/channel/life/8-clever-solutions-for-cleaning-windows-2405885/