The main components of washing powder are: surfactant (commonly used is sodium dodecylbenzene sulfonate), water softener (commonly used is sodium tripolyphosphate), alkali agent (commonly used is alkali and sodium silicate), bleach Agent (some detergents use sodium borate as a bleaching agent), enzymes (mainly a complex enzyme composed of protease, lipase, cellulase, etc.), fluorescent whitening agent, carboxymethyl cellulose (with anti-redeposition effect) , Flavors, pigments, fillers (mainly sodium sulfate, which plays a filling role and makes the product look a lot). Among them, surfactants, enzymes, carboxymethyl cellulose, etc. are all active substances, which will react with the air for a long time to decompose and lose their washing and decontamination effects. The decontamination effect of expired washing powder has been greatly reduced, and the denatured washing powder composition may also damage clothes. If you wash your hands, you may also damage your hands. Therefore, under normal circumstances, detergents that have expired should not be used.