To quote the
American Society for Microbiology (EBD is ethanol-based disinfectants, AHR is Antiseptic Hand Rubbing using alcohol solutions, IAV is influenza A virus , and yes they are different viruses and the Covid-19 is more aggressive but the subject is the effectiveness of alcohol solutions for virus prevention)
IAV in mucus remained active despite 120 s of AHR; however,
IAV in saline was completely inactivated within 30 s.
Due to the low rate of diffusion/convection because of the physical properties of mucus as a hydrogel,
the time required for the ethanol concentration to reach an IAV inactivation level and thus for EBDs to completely inactivate IAV was approximately eight times longer in mucus than in saline.
The most important finding there is that you need 240 seconds of active hand rubbing in the alcohol solution to kill a virus and only 30 seconds in saline. NOBODY keeps their hands wet and rubbing for four whole minutes when using alcohol. Most barely use four seconds and then with only a minute volume of the alcohol solution...
.