ok, first of all, how does that washer fluid get INTO the car where the people are sitting..??
no way that i can think of.
i can see the radiator antifreeze (aka: coolant) seeping into the passenger area via a bad heater core, but the washer fluid..??
i think not.
many people (and some of you have seen this) drive with the outside vents closed. you see this, as they pass you, or you pass them, and the windows are all fogged up. as a result, they are inhaling the same air over and over again, and everyone's germ's to boot. this is how someone can get sick.
everyone needs to be driving with the fresh air vents open. (or the windows slightly open as well)
and that is simple enough.
instead of the "MAX" setting on the heater-a/c control, slide it over to "NORM". this allows the duct work to open up the plenum doors to allow fresh air to enter.
i see no real viable way for the washer fluid to enter the air-stream of any vehicle, unless, some dope keeps it in the car, back seat area, and the top is not closed properly, and the jug falls over and spills.
so since this is a "Popular Science" article, i will take this article with the usual grain of salt, like i would usually do in the past, when they warned us of such other horrors.
until it is in the N.E. Journal of Medicine, it's just page filler.
now as for the DEF..??
synthetic products...??? open skin wounds....get some on the wound..???
well then..maybe, i am sure.