Alcohol at 75% can effectively inactivate the new coronavirus, but it should be noted that alcohol is flammable and should not be overstocked, much less sprayed in the car. When the concentration of alcohol is higher than 70%, the volatilization of alcohol increases the combustible gases in the air inside the car, and a small spark in the air may cause a burst of flame. Spraying alcohol solution will also increase the humidity in the car, long-term humidity is easy to make the car interior mold, damage to electronic circuits. Car disinfection, should pay attention to ventilation, and at the same time be wary of ventilation for too long temperature reduction caused by colds, when in the underground parking lot, it is recommended to close the windows, open the air conditioning internal circulation way to ventilation.