Hand hygiene is the most effective way to prevent the spread of disease. People should maintain good hand hygiene. When hands are visibly soiled or contaminated with blood or body fluids, wash them with soap and water. If hands are not visibly soiled, use a 70-80% alcohol-based hand rub. According to the World Health Organization, most alcohol-based hand rubs contain ethanol, isopropyl alcohol, n-propanol, or a combination.
Details: https://www.chp.gov.hk/en/healthtopics/content/460/19728.html
Source: Hong Kong Centre for Health Protection