Because there are always some resistant to the sanitizer.
Which, if you dwell on it, will disturb you.
I mean, so what if you kill 99% of germs if that 1% "gets you"?
Kind of a pyrrhic victory.
Why do hand sanitizer always say "kills 99 percent germs". But not 100 percent?
I figured it was to "cover their butt" from a law suit if someone gets sick and then get sue happy by saying "you said 100 percent KILLS germs! So why'd I get sick! False advertising!!"
I could see it now!
Lawyers
Bcuz the only things in life that r 100% is death & taxes.
Otherwise it's 99 %
Because it’s 99.9% satisfaction guaranteed.
Well, you can't have a solvent that dissolves everything because you would have no place to store it.
May be there is a similar reason for a germ killer.
They aren't sure about 1%.