just had science with ds and looked at sanitsier v soap and water handwashing. (online school, live stream class).
a single usual amout of sanister v 1 round of happy birthday= same reduced 1/2 of germs (it was tested with a nice dollop pf e coli!)
absolutley soaking wet/ dripping sanitiser = 99% no germs. have to air dry hands and dont go near a naked flame lol!!!!!!!!!!
x2 happy birthday/ good handwash technique or longer= nearly the same!! cheaper, any ol soap, done and on your way.