No-Rinse Shampoo is an excellent way to thoroughly clean your hair without water. Simply Massage in without worry of residue. No-Rinse is used by all NASA astronauts on space missions, but it will work great for you in the backcountry or at home! There is absolutely no rinsing required, it gets you clean, fresh and odor-free, and is not drying to the skin. This product is excellent for hunters who wish to elimate human odor, and for backpackers, hikers, quick clean-ups anywhere, invalids or others who cannot take a bath or shower for some reason, and for use where water is scarce or rationed.