We have two silkies for my childs 4-H project, and when we got home with them, they were covered in lice. (We will forever be checking any new birds we get). I have treated with Permethrin 10,and we are not finding any live lice at all, but we have to get all of the nits off or they will be D/Q from showing. What is the best method to remove the nits? The birds are Silkies if that makes a difference.