I remember watching a talk from a chap who started his own cleaning business. They found themselves doing more and more "niche" cleaning - mopping up blood spil

I remember watching a talk from a chap who started his own cleaning business. They found themselves doing more and more "niche" cleaning - mopping up blood spillages in nightclubs, working with police cleaning houses after gruesome murders or just old guys who fell down the stairs and weren't found for months. Apparently, getting brain matter out of stair carpets is a real challenge. Anyway, they were using off-the-shelf cleaners for this kind of thing, with 99.9% promises on the bottles. At some point, they had to submit samples of their cleaning agents for testing. Turns out, some of the 0.1% of viruses and bacteria happened to include the really bad ones - Hepatitis I believe was one of the scariest survivors (particularly problematic in nightclub blood cleanups) and some of them even thrived in the chemicals. That said, I don't think that's what this article is saying, as they aren't testing different pathogens - they're testing a single pathogen, and only 0.1% of the mass passed through remained viable. Still, don't underestimate that 0.1%. If it can multiply, it can kill you.