Lather, Rinse, Repent is the 7th episode of Sabrina's Secret Life.
Sabrina uses a magic hair lotion that makes her hair smooth, silky, and curly. All the boys in school start to admire her for her hair. This makes Sabrina take advantage of her new popularity. Cassandra then takes the lotion bottle and gives some to the whole school, who turn into werewolves after using it.