Formulated with ingredients to remove bug residue, road grime, bird droppings, and tree sap from windshields. Cleans to a streak-free shine with a fresh citrus scent. Summer windshield washer fluid handles common hard to handle obstacles. The tree sap is softened, emulsified and rendered easy to remove. Prestone’s patented formulation penetrates biological deposits of bugs and bird droppings to break down and emulsify them. Size 1 gallon.