Refill cartridges are designed for the Just Add Water System, a safe, economical, ecological, efficient cleaner that only requires water. The portable JAWS cartridge automatically delivers the precise amount of concentrate. All you have to do is fill your work bottle with water, insert the JAWS cartridge, screw the trigger spray back on and clean. With an ammonia-free, alcohol-free and no-streak formula, Glass and Hard Surface Cleaner cleans fingerprints, grease and smudges from appliances, computer monitors, Lexan and Lucite, mirrors, plexiglas, windows, granite countertops, LCD Television Screens and more. Small cartridges in a compact box dramatically reduce space.