Works by safely and effectively breaking down and removing mineral build-up from the interior of your machine, including hard-to-reach parts like the heating element and sprayer arms. Remove sticker from top of bottle without removing the cap. Make sure your dishwasher is empty. Place the bottle upside down inside the silverware basket or in a secure position and run the dishwasher. For best results, use once a month. 8.45 fl. oz.