I've always wondered…

It is. Thats why you should never use Sanitizer alone. What happens is that germs or bacteria can quickly mutate to become immune to the sanitizer/alcohol in there. You want to use warm water and soap every once in a while too.

I could be wrong but I remember this being true from a while back.
 
They would put 100% on there if they wouldn't get sued when someone who got sick and had been using it. They can't guarantee every single germ was killed
 
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