There’s a nice way to combine the WHO guide with the trick of singing “Happy birthday” twice to time the ~20 seconds that handwashing is supposed to take. You do steps 1 and 2, then sing “Happy birthday to you” while doing step 3, then sing “Happy birthday to you” while doing step 3 with reversed hands, then sing “Happy birthday to meeee” while doing step 4, etc.
There’s a nice way to combine the WHO guide with the trick of singing “Happy birthday” twice to time the ~20 seconds that handwashing is supposed to take. You do steps 1 and 2, then sing “Happy birthday to you” while doing step 3, then sing “Happy birthday to you” while doing step 3 with reversed hands, then sing “Happy birthday to meeee” while doing step 4, etc.