Use a bucket of warm water and a sponge or cloth to wash the window.
Mix 1/4 cup vinegar with 2 cups of water and use this mixture to clean the windows.
Soak a rag in ammonia and rub it on the windows.
Mix equal parts rubbing alcohol and water, then pour it into a spray bottle. Spray this solution on the windows and clean them with a cloth or sponge.
Use a commercial window cleaner to wash the windows.
Pour 1/2 cup of ammonia into a gallon of water, then use this mixture to wash the windows.