I hope the birds have made a recovery. I can share some pictures of what I have been going through with the silkie with the scaley leg mites. I took these pictures the night I got him. There were parts that were yellow and spongey. I guess I should have taken more pictures.
I soaked him in water and dish soap for a half an hour and then removed by hand what I could. I then put some coconut cream.oil on them. A week later I did this again and then I sprayed his legs with Adama Dog flea and tick spray. The following week I put oil on him again. This will take a long time (months) to heal. This photo is what I could pull off the first night. And yes it was yellow and spongey. A couple of times I got a tad too deep and he started bleeding so I had to stop.
click for a close up (only if you have a strong stomach)