Neem Seed Oil works better than anything I have ever used. I put it full strength directly on the bird where the mites are, touching the skin. How much you use depends on how many mites they have. I have a rooster who the mites love to target, and finally something works very well and he gets some peace. I use it on him about every 3-4 weeks, when I see some mites on him again. I also put it on their roosts, to keep the mites off ones that are not infested. It doesn't take much on the roosts. I don't put it on any birds unless they have mites on them. I found the remedy here on BYC. There's a thread I believe called Need Oil for Mites.