This article is worth a read regards Demodex and it mentions Amitraz which is what Aludex contains..
http://www.peteducation.com/article.cfm?cl...p;articleid=729
Iv'e got this one from NorthernTool. It may cost a few quid but i have had it 5 years or so and it does the job well....Cheers..Ian.
http://www.northerntooluk.com/products.asp?partno=168620E