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Key points

• Wearing a mask and washing hands are effective ways to prevent COVID-19 infection — but not everyone knows how to wash their hands properly.
• Handwashing should take more than 20 seconds.
• The demonstration uses black paint: palm against palm, then fingers interlaced, then palm against the back of the hand, repeated on both sides.
• To do it better still, rub each finger separately, then the thumb, and finally the wrist.
• After all these steps the whole pair of hands is thoroughly washed.