Clean windows, screens and exterior walls with your garden hose—no ladder or bucket required. Simply pour the powder into the cannon bottle (included) and spray from the ground, just like the pros. A bag of Full Crystal cleans up to 20 windows and screens, while Full Exterior cleans up to 2,000 square feet of aluminum, vinyl, brick, wood, stucco and more. Each kit includes 1 cannon and 1 bag of Full Crystal. Each Refill includes 2 bags. Will not harm grass or plantings.