Gather a bucket, warm water, mild dish soap, microfiber cloths, a sponge, and a squeegee
Remove dust and loose dirt from the window frame and sill
Mix a small amount of dish soap with warm water
Dip a cloth or sponge into the solution and wring it out
Wipe the glass from top to bottom
Clean corners and edges with a cloth
Use a squeegee to remove the cleaning solution from the glass
Wipe the squeegee blade after each pass
Dry the glass with a clean microfiber cloth
Clean the inside and outside of the windows
Wash the window frames and sills
Remove streaks with a dry cloth
Repeat if needed for heavily soiled windows