Alcohol in the fire hazard belongs to category A, when the alcohol in the air reaches a certain concentration, encounter the ignition source will flash ignition. Therefore, when using alcohol, on the one hand, we should stay away from ignition sources, at home to avoid the kitchen gas stove, lit cigarettes, heaters, etc. It is worth noting that clothing static electricity may also ignite alcohol; on the other hand, alcohol can not be used in large quantities, only in a small area of disinfection, do not use a mop with alcohol mopping disinfection, or a large number of indoor spray. Therefore, although alcohol is a good disinfectant, it is only suitable for small-scale skin wiping, and should not be sprayed over a large area.