Unless you've been living under a rock for the past few weeks, you've seen videos, on the news, showing workers (and sometimes huge trucks) in China, Korea, and other places, spraying, and often fogging, huge outdoor areas. Supposedly this is doing something about the new (that's what "novel" means) covid-19 coronavirus.
Now, washing your hands, and possibly surfaces, regularly is a good preventative measure. But this isn't washing. It's just spraying (or fogging). Spraying surfaces with bleach, if there is a risk that they've been contaminated, or even just on a regular basis, probably will kill most bacteria, and even most viruses. But this obviously isn't bleach, because it's often being sprayed around food markets, and you don't want bleach all over your piles of fresh fish fillets.
I can't (and my opinion was seconded by an infectious disease expert) think of anything that you can randomly spray around large areas that would a) kill viruses, and, at the same time b) not kill people (or, at least, seriously compromise respiratory systems).
But, when people are scared, you (as a government) must be seen to be doing something, even if the "something" does nothing to address the actual risk.
............
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