Andrew Kemp, Head of Scientific Advisory Board on the British Institute of Cleaning Science says that the alcohol-based hand sanitizing gels is yet to be proven to kill the virus causing Covid-19 on your skin.
Instead the overuse of alcohol based hand sanitizers could cause the bacteria to become resistant and become a superbug that could threaten public health.
To clarify why this happens: This is a consequence of alcohol being the only active ingredient, meaning that if a certain amount of bacteria survives the initial application, the surviving strain replicates becoming resistant to all alcohol at that specific concentration. Hence the never ending arms race against raising the alcohol levels against these new strains. What is worse, is that alcohol contains the actual nourishment bacteria needs to replicate. Ineffective alcohol is food for bacteria.