Person cleaning windows

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Here's something you don't ever want to do: cleaning windows in the hot sun. Direct sunlight can cause the cleaner to evaporate before it is wiped off, leaving those nasty streaks we all dread. So, the best time to clean your windows is in the morning or early evening when windows cool down. Try the touch test: If the window is hot to touch, then it's too hot to clean.

To clean your windows, apply cleaner to windows with a slightly dampened sponge and wipe the entire window. Then, with a squeegee, wipe across the window, cleaning the squeegee after each pass.

To clean up any drips, ditch the paper towel and use yesterday's newspaper instead.
— Frank Fontana