Household toilet bowl cleaner and 84 disinfectant should not be used at the same time because 84 disinfectant is an alkaline detergent whose main ingredient is sodium hypochlorite, which reacts chemically with hydrochloric acid, the active ingredient in toilet bowl cleaner, to produce chlorine gas. Chlorine gas is a yellow-green irritating gas that is highly irritating to the mucous membranes of the eyes and the skin. Not only that, but inhaling chlorine gas can also stimulate the respiratory tract and make people cough more than once, which can even cause breathing difficulties in severe cases. Be sure to read the instructions carefully before using cleaners, never mix cleaners, if improper use of toilet bowl cleaner and 84 disinfectant at the same time and produce chlorine gas, the user should immediately evacuate the scene to fresh air, and promptly open the windows to ventilate. If the condition is light, wear a mask immediately and take a break in a ventilated place to relieve yourself; if the condition is serious, call 120 for help or send to hospital for treatment.