Step 1: Put away your stuff. Each person needs to put away his/her lunch and throw out his/her garbage.
Step 2: Make sure shared stuff is away to. Extra chairs and desk go back to their spots. All desks are lined up straight.
Step 3: Clean up spills and messes. Use wet paper towels and brooms to clean any bigger messes.
Step 4: Final check. Use your eyes to see if anything has been missed. Clean that too.