Covid-19: why is hand washing so effective?

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With scientists still racing to find treatments for Covid-19, Nicola Davis speaks with Prof Pall Thordarson about why soap is so effective at deactivating Sars-CoV-2 and how this differs from hand sanitiser.. Help support our independent journalism at <a href="https://www.theguardian.com/sciencepod">theguardian.com/sciencepod</a>