Water Spot Remover was developed for the stubborn hard calcium built up water spot associated with sprinkler water sports or rain water spots left on a car for long periods of time. Walt' Water Spot Remover (WWSR) is made with a special blend of mild and aggressive acid cleaner. These cleaners work together to deeply embody the hard calcium water build up and allow you to wipe it clean in just seconds. First rinse surface removing dirt and cooling the surface. Ready to use or diluted to desired strength. Use a cotton terry cloth towel and spray product into the towel. Rub the surface clean till there's no water spots. Work in area no bigger than 2'X2' Do not allow product to dry or run on the surface. Wash are with Super Car Wash. Always apply to cool surface. Test the surface in a inconspicuous are first to determine if the surface is sensitive to avoid damages. Do not use on pitted or chipped windows. Do not allow product to contact raw metals such as aluminum. Always wear safety gear; gloves & goggles and avoid contact with clothing when using this products.