Combine 3 1/2 ounces of Finish Jet-Dry, 2 gallons of hot water, 1/4 cup of ammonia, 4 tablespoons of rubbing alcohol and 1/4 cup of powdered, not liquid, dishwasher soap to make window cleaning solution, recommends Norman Husser for Husser Window Cleaning. It removes filmy buildup, spots, prints and grime.
People often consider homemade window cleaners less expensive and more effective than commercial cleansers, observes Husser. Many do-it-yourself cleaning agents contain vinegar because it clears away film and is safe and natural. One such recipe calls for 1/4 cup of white vinegar, 2 cups of water and 1/2 teaspoon of liquid dish detergent. A variation of this formula uses 1/4 cup of white vinegar, 1 gallon of water, 1 teaspoon of liquid dish washing detergent and 2 tablespoons of lemon juice. Dawn dish soap is recommended because it is biodegradable.
Some homemade window solutions incorporate cornstarch because it prevents streaking, states Husser. One method mixes 2 tablespoons of cornstarch, 1 gallon of warm water, 1/2 cup of white vinegar and 1/2 cup of ammonia. A simpler option uses 1 tablespoon of cornstarch, 2 cups of warm water and 1/4 cup of white vinegar. In both versions, the cornstarch must be completely dissolved.