I wonder if the "dilute to 70%" rule for isopropyl applies to coronavirus. My understanding is that you dilute 99% because you need the water to catalyze action on bacterial cell walls. But that wouldn't apply to virions.
(I ask because I worked a polling precinct on Tuesday and 99% isopropyl was how I disinfected the smartcards that unlocked the BMDs for voters and then got passed back to us; it definitely did not evaporate instantly on those cards).
I'd be interested in knowing whether anyone with expertise on this subject has thoughts on it. The boy is a biochem junior (and in my living room, because of coronavirus) and he doesn't have a firm answer on whether it would or wouldn't work.