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 & clean. With an ammonia-free, alcohol-free & no-streak formula, Glass & Hard Surface Cleaner cleans fingerprints, grease & smudges from appliances, computer monitors, Lexan & Lucite, mirrors, plexiglas, windows, granite countertops, LCD TV Screens & more. Small cartridges in a compact box dramatically reduce space.