Glass Gleam 4 - Glass and Window Cleaner - Highly Concentrated - 1 Gallon Makes 512 gallons of RTU Product GG-4 contains a new detergent system allowing improved cleaning and degreasing of the glass High-tech polymeric water softeners condition the water to greatly reduce dirt redeposition Great for cleaning exterior and interior windows It was developed by professional chemists specifically for glass High concentrate designed to mix with water