Two years. Shops must take effective measures to eliminate and kill the four pests for two years, and achieve good control effects. In order to effectively improve customer experience, this system is formulated. Clean and disinfect the shop environment comprehensively, and wipe and disinfect the surfaces of high-frequency contact objects such as door handles, desktops and countertops with 250mg/L chlorine dioxide, 500mg/L chlorine (bromine) disinfectant or other disinfectants.