The key is not to have them to begin with and quarentine new addition just like you would for snakes and treat them preventively just like you would snakes, PAM (Provent A Mite), NIX, Permethrin (at the right dosage all work great).

So same thing if you already have them any of those products will work., you must spray the racks and tubs all of them and let dry (not the rats) and repeat as needed.