The correct answer is: Soap.
Soaps are sodium or potassium salts of long-chain carboxylic acids, also known as fatty acids. They are produced by the saponification of fats and oils. Soaps are used as detergents, emulsifiers, and foaming agents. They are also used in cosmetics, pharmaceuticals, and other industries.
Bleaching powder is a white powder that is used as a bleaching agent, disinfectant, and deodorant. It is made by the reaction of calcium hydroxide with chlorine gas.
Baking soda is a white powder that is used as a leavening agent, antacid, and cleaning agent. It is made by the reaction of sodium bicarbonate with carbon dioxide gas.
Washing soda is a white powder that is used as a laundry detergent, a cleaning agent, and a water softener. It is made by the reaction of sodium carbonate with water.