This highly-concentrated glass cleaner delivers sparkling glass plus unbeatable value.  This ammonia-based glass cleaner is perfect for spray bottle refills and other glass applications. Best of all, one gallon of Sparkle can be diluted 1:20 yielding 21 gallons of cleaner -- or leas than 18 cents per quart.  Dilution Ratio:  6.5 ounces per gallon.