Major Clanger has invented a new machine to clean up the planet. It's like a sit-on vacuum cleaner with a giant nozzle. Tiny and Small are intrigued as he drives it up onto the planet's surface. But before he can really demonstrate how it works, Granny calls him down - it is his turn to pick the blue string for the pudding. Major departs, but not before telling Small and Tiny in no uncertain terms, not to touch the machine till he gets back. But once he's gone Small just can't resist, and neither can Tiny. Small gets the hang of driving it very quickly, and soon he is charging around the surface, picking up everything in sight. Not content with that, he takes it into the living cave and then on down into Mother Clanger's garden. But he temporarily loses control after sucking up some soapy water that Mother has spilt, and by accident sucks up some of Mother's flowers, and, even worse, a small swarm of Glow Buzzers. Tiny and Small can hear them buzzing inside the machine. Then Small has a clever idea. He puts the machine into reverse. Soon all the things that have been sucked up are being blown out again. Last out are the bubbles from Mother Clanger's spilt soapy water. But there is no sign of the Glow Buzzers until....a giant bubble emerges. And inside are all the Glow Buzzers. Tiny and Small breathe a sigh of relief, but as they do the giant bubble starts to rise - it is floating up to the planet surface, out of their reach. Really worried now, the young Clangers race up to the surface, only to see the bubble rising into the sky. Small knows there is only one thing to do. He and Tiny jump into the music boat to chase after the bubble. And at last, by casting a fishing line at it, they burst the bubble and all the thankful Glow Buzzers spiral back down to the planet. The adult Clangers have been watching and applaud Tiny and Small's rescue. But when they land, Major tells them off - they should have waited till he showed them how to use the machine properly. But anyway, he'll show them now. He climbs on to the machine, but when he starts it up, the handle falls off and the machine careers out of control again, chasing Major Clanger around the planet as the other Clangers run for cover!