To squeegee clean windows, start by preparing a solution of water and mild dish soap. Wet the window surface with the solution and then use the squeegee to remove the dirt and grime in a sweeping motion. Begin at the top corner of the window and pull the squeegee down, wiping the blade with a clean cloth after each stroke. Repeat the process until the entire window is clean, ensuring that you overlap each stroke slightly to avoid streaks. Finally, use a dry cloth or paper towel to wipe any remaining moisture or streaks from the window for a sparkling finish.