I don't have an answer for you, but try www.earthclinic.com they are a great website for alternative methods. They have a section for pets and I think mange as well. Best wishes for a quick and lasting solution.
Login using the form on the top of the page to post feedback if you have registered with ThriftyFun. If you have not yet registered, click here. It's FREE!. If you are not registered you can post feedback as a guest below. Please don't use your email address for your name because spam robots can dredge it from our site. Please do not post your feedback more than ONCE. We need to approve all guest feedback and it may take from minutes to hours for that to happen.