The basic alcohol often used in hospitals is 75% alcohol, 95% alcohol acts on the pathogen, it will make the protein coagulate immediately, so that a protein shell is formed around the pathogen, and the result becomes its protection instead. Therefore, the higher the concentration of alcohol is, the better it is for disinfection. 75% of alcohol is just right, as it can destroy the pathogens, but also does not form a hard shell to protect the virus, so 75% of alcohol is most commonly used in clinical practice. And 95% alcohol is generally used for wiping machines, lenses, and to do alcohol lamp burning, and is not used for medical disinfection. If there is no 75% alcohol, you can also dilute 95% alcohol according to the formula and use it when dispensing to 75%. There are even some white spirits that can be used as a disinfection substitute if they are diluted to 75% or more. Content source: Dr. You Lai