Gunk Concentrated Windshield Wash and De-Icer with Ammonia makes 1 gallon of de-icer or 6 gallons of windshield wash solvent. It's small size and weight helps environment through less transportation-emissions. As an anti-freeze, it helps protect windshield washer systems from damaged caused by temperatures as low as -31-degree Fahrenheit. Streak free ammonia formula. This solvent is easy to use by just pouring some or all into the fluid tank and adding clean water. 50 state compliant.