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Why is washing your hands with soap and water for 20 seconds important?
The coronavirus that causes COVID-19 is wrapped in an envelope of fat.
The layer of fat is dissolved by soap; when it is dissolved, the virus falls apart into useless pieces and can no longer infect you or others.
The temperature of the water does not matter.
The kind of soap doesn’t matter – no need for it to be antibacterial or have special characteristics.