Burning question of the day

You know products that advertise, "Kills 99.9% of germs"? Does that mean that the product kills 99.9% of the various types of germs out there (in other words, it works on all except 0.1% of types of germs in the world), or does it mean that it kills 99.9% of the total germs in the particular area you are cleaning?

What if it kills the type of germ I am trying to clean off of my toilet (thus fitting in to the 99.9% of the types it kills), but it only kills half of them? So, say there are 1,000,000 Germ X on the toilet, and my product does indeed kill Germ X. Am I guaranteed that 99.9% of all the Germ X on my toilet are going to die?