Here are a few tips to help you get this chore done:
Wash one side of a window with horizontal strokes and the other side with vertical strokes. That way, if there are any streaks, you can see which side of the window they’re on. What a great idea!
Start at the top of the window and work down, to prevent drips.
Prevent streaks by using a squeegee. You can get a sponge/squeegee combo attached to a telescoping handle to really make quick work of cleaning.
Dry your squeegee with a rag after each swipe. Otherwise, you will leave visible lines on the glass.
Use a toothbrush or cotton swab to get into those tight corners.
Wash windows on a cloudy day. Sunlight dries the windows too quickly, before you have a chance to polish them.
Polish the glass with newspaper or a clean blackboard eraser for extra shine.