Honk! Honk! Clank! Belch! 5 powerful trucks tell how they got so grubby. The dump truck explains- Hauling rocks from the gravel pit, working in clouds of dust and grit. It's what I love! It's what I do! Wouldn't you want to play in dirt too? The jolly manager at the Big Truck Super Wash welcomes each dirty truck with a warm smile, shampoo (gurgle and gush), steam, scrubbers (swish-a, swoosh-a), and a rinse. The trucks can return home glistening, gleaming, and spot-free.