Wiping surfaces is fine for coronavirus, but the main risk is through the air. How to tell if your ventilation is OK

PHILADELPHIA — Once an hour, sometimes more, employees at Weavers Way Co-op grocery stores diligently wipe disinfectant on all “high-touch” surfaces: the checkout counters, the banisters, the plastic nozzles that dispense gourmet granola. At Whole Foods Market, workers sanitize even more often, wiping the credit-card readers between every customer.“Deep cleaning” is the coronavirus catchphrase of the moment as more retailers, schools, and offices increase their indoor operations. And in at least one case, the goal seems to be deep and long-lasting: Witness American Airlines’ plan to use a clea...

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