Simply use this like a bar of soap, while rubbing it on your hands, soaking your hands in the water. The exterior is made of food-grade 304 stainless steel, which is smooth and comfortable, and can effectively remove odor. The interior contains high-grade soap, which has a fresh smell and does not contain harmful ingredients to the skin, and can effectively remove dirt. Negatively-charged stainless steel soap combines with positively-charged water amino acids to neutralize odors.