We have a baby pool in the barn and also the bottom half of an old ferret cage, both work well as dust baths. I fill ours with clean top soil and mix in some playsand, or Diotamaceous Earth (food grade kind), or wood ashes, or Insectrin dust. I'm not very scientific about the proportions, I just throw in some of whatever of those things I have, but they use it anyway. I don't like to use chemicals, but I'll add some Insectrin powder if it seems like they are getting a lice problem. Wood ash works well mixed in the bath...the lye in the ash kills the lice. Or so I've read. It seems to. We use two dustbaths located in different places, so that hopefully everyone gets a chance to use one or the other.