About once a month I do a clean desk check. After school I put one of these cards on the desk of each student that has a clean desk--both inside and out. Sometimes I pass out a small candy or prize, and sometimes I just pass out the card. My first graders are happy to find that the desk fairy caught them with a clean desk!
To keep up with my growing supply of elementary science resources, please become a follower and visit my store at: http://www.teacherspayteachers.com/Store/Engaging-Lessons-By-Frank