GlossTec Car Wash - Half Gallon Concentrate This 1/2 Gallon Glostec Concentrate which mixes with water to make 256 Oz(2 gallons) of ready to use product. Enough product to wash your car 20 to 25 times. (Number of washes varies from person to person and car to car) most washes take 10-12oz of product depending on size and level of soil on the car. Use to refill the GlossTec Pressure Sprayer. Good for 20-25 washes Reduces cost to about $0.60 per wash.