My flock never used a designated area to dust bathe they just dig holes everywhere and start batheing. My question is what can I put down for them to bathe in? There run is dirt and right now I’m treating them for mites. (We have a rat that we can’t get rid of and I’m thinking that’s how they got them). I’ve been using DE for them to bathe in but what else can I add to their dirt to help them out more?