Andy and the Snare's Penguins

When Mr Hammond asks Andy to make sure the Snare's penguins are nice and clean for their welcoming party at Safari World, Jen suddenly notices that they are caked in mud and refusing to get into the sea. Andy jets off to New Zealand in his safari-mobile to find out how these forest-dwelling penguins get themselves clean. But will Andy find the answer before Mr Hammond notices anything is wrong?