84 disinfectant and alcohol cannot be used together. 84 disinfectant is a strong oxidizing agent, while alcohol is a reducing agent, when the oxidizing agent reacts with the reducing agent, a chemical called chlorine gas will be produced. Chlorine can cause irritation and even damage to the skin, cornea, respiratory mucosa and oral mucosa, which can lead to corneal ulcers, respiratory mucosa ulcers, and even oral mucosa ulcers, so 84 disinfectant and alcohol cannot be used together. When using 84 disinfectant can be properly diluted, the concentration is 1:200-1:500, if it is 75% medical alcohol can be used directly, without dilution, but the two can not be used together.