One of my students taught me about this gem to get students racing to clean the room: Magic Scrap. To start, pick a special piece of trash that will win the prize. When the teacher yells "magic scrap", the students scramble to be the one to find the chosen piece of trash. I wait until the room is spotless before announcing the winner. I kept a bin of goodies on hand to pass out, like pencils, erasers, mints, etc.
I'm just a science teacher sitting at my computer generating and finding ideas to make learning more enjoyable.