Around the middle of the school year, my students tend to get a little lazy with their cleanup. This is the time I implement a sanitation scavenger hunt. I find all the problems and write them down. I divide the students into groups of four and the first group to find all the problems wins a dessert of their choice and extra credit. The "losing" groups get extra credit, depending on how many they find and they have to fix the problems. They look for things such as improper storage, improper cleanup etc... This really gets them back in line.