Diatomaceous Earth should take care of ur problem.. If u do some research on it, it will tell u about DE dust bath n putting DE in the co-op among so many other things
Diatomaceous Earth should take care of ur problem..
http://www.earthworkshealth.com/pets-animals.php?gclid=CjwKEAjwj92_BRDQ-NuC98SZkWYSJACWmjhlkvFdEZJjCQ4Qc8_6jNvzHMZg9vzUx6rtjALOKoDv4BoCZO7w_wcB
Have u tried cleaning there house real good n then put some Diatomaceous Earth all over before in u put any bedding back in? http://www.earthworkshealth.com/products.php