I'm a teacher and a mom. I agree with what most people have already said. There is absolutely no way there would be time to have an entire class (especially the little ones) wash their hands after playing. They'd be left with zero time to eat. I know most of my students (and my son) have single pack wipes in their lunch box or bring a small bottle of sanitizer in their lunch box. And honestly out in the fresh air they are probably getting less germy than in the actual classroom lol. They don't dig or anything, usually just run around a bit, play ball or go on the playground.