Dilute high concentrations of medical alcohol, preferably with distilled water. If you don’t have distilled water at home, you can dilute 95% medical alcohol with cooled plain water, and dilute the concentration to 75% for the best effect, which has inactivating effect on the new coronavirus. Specific method can be in a 100mL measuring cup poured 78.9mL 95% alcohol, and then add cooled water diluted to 100mL can become 75% alcohol, or in 100mL 95% alcohol and then add 26mL distilled water or cooled water, can also be diluted to 75% alcohol.