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Not sure if all the retailers are out of this stuff, but it's magic:
https://www.purebio.com/technology/silver-dihydrogen-citrate-sdc.htm
Active ingredient is Silver Dihydrogen Citrate, and according to the FDA/EPA registration (and consistent with other published material) it kills corona virus almost immediately (30 seconds, vs 10 minutes for traditional ammonium chloride products). Also effective against a very broad spectrum of microorganisms and virii (listed in the MSDS and technical specs linked in that page).
It is non-toxic, non-caustic, colorless, odorless, tasteless, does not produce toxic fumes, and on hard surfaces it has residual effectiveness for 24 hours. Also more stable than other silver-based products, with several years of shelf life. I've been using it for years and have found that even flies won't land on surfaces that have been wiped down with it. It can stain some surfaces but I've never had that problem with it.