I've used GSE (Grapefruit Seed Extract) before for sinus infections, and it worked great (just watch how much you put in because my step dad had us mix 5x as much of the stuff as you were supposed to with saline...and it didn't stop hurting for 4 hours). So, I was looking up other uses for it, and I remember it being in the most recent newsletter from BNW, and I found this article:
http://www.landofvos.com/articles/kitchen7.htmlIt tells other uses for GSE for bird stuff!