Thomas & Friends Season 6 Episode 18 Percy’s Chocolate Crunch Episode Title:Percy’s Chocolate Crunch.Episode Description:Percy is upset that he has all the dirty jobs, and due to a water shortage, he is restricted one wash-down per day. He desperately tries to stay clean, but he gets dirtier everywhere he goes, frustrating him even more. Percy's driver suggests delivering sugar to the chocolate factory, a job that Percy eagerly accepts as he is sure he will not get dirty from it, but when he arrives, he skids on the tracks due to an oil spill, then accidentally crashes through the factory and gets covered in chocolate. However, Percy is delighted when the Fat Controller tells him he will be granted a wash-down and a repaint as a reward for showing that usefulness comes before cleanliness.