Mud, Mud and More Mud!!

I have a number of students that are coming in from each recess covered in mud. In their defense, the yard is a mud pit in some places and understandably, accidents happen. However, I have some who are head to toe mud because of the games they are playing in the mud. In an effort to keep the portable in a safe and clean working condition, I need for these students to bring in extra pants, shoes, socks...whatever they need to change into so that the level of dirt in the portable can stay at a minimum. The floors are becoming very slippery, the carpets are being caked in mud and the dust level is high, affecting the allergies of some students. Thank you for your support.