The good folks at Sesame Street have some great resources on hand washing, or as I like to call it “Hand Washing Sesame Street Style.”
These resources pre-date the current Covid-19 pandemic, but they are great for teaching kids about the importance of hand washing. The resources include a video:
The video includes the following description:
Together, enjoy Bebe’s handwashing song. Then, ask kids to describe each of Bebe’s steps. Remind kids: first comes water, then the soap. Then you scrub, rinse, and dry! You might also ask, “Why do you think this family is called the Feelingwells?” “Why and when is it important to wash your hands?”