I'm not from familiar with your area, but isn't AZ dry enough that they can take care of it on their own?Still trying to figure out how to post in the AZ thread, but anyway....... My girls don't like the stuff I have tried for the dust bath. They seem to like really fine dirt, but I can't find that anywhere. What mix do you use that your girls like??
Someone asked me about providing a dust bath, but I always thought it was something for chickens that were permanently coop confined in a coop with a concrete type floor. Mine have a few dry shady spots (one in the run, one outside it and I'll periodically walk out to see them run up and shake all sorts of dust off, that it isn't a major concern.