Using castor oil for scaly mites sounds like a good idea. I have not even got my chicks yet...laughing. I have bucket-o-castor oil on hand because I use it in soap making.
From a soap making site-
Castor Oil is rich in fatty acids and is soothing and lubricating. It is a humectant that attracts moisture to the skin. Castor Oil is routinely used in hair oils, balms, and other thick emulsions for the skin and hair. In combination with other oils and as a superfatting agent, Castor Oil lends emolliency to soap formulations. It, however, should be used at a low percentage to keep the soap from becoming too soft.
I think a couple of drops of tea tree oil in the castor oil would be a great idea. I use some castor oil in my blend, with sunflower oil, for oil cleansing my face. This has been an informative thread. Way cool.
Debbi