"Moydodyr" is a children's animated fairy tale based on the verses of Korney Chukovskiy. The narration in the film is from the face of a little untidy boy, who is the main character. His own things suddenly begin to run away from him. And then, appeared from nowhere, the speaking wash Moydydir begins to explain to the youngster that things ran away from him for a reason, because he is so dirty. Moydodyr gives orders to his subordinates, brushes and soap, and they pounce on the boy and begin to wash him. The boy in a panic runs out into the street, but discovers that a sponge has rushed after him in pursuit. A crocodile walking along the street comes to his aid.