My poor fellas have had lice for some time now and with countless visits to the vet I think the lice have gotten immune to the Ivermectin and Revolution. It isn't doing a thing for them, I have also tried different sprays, from Petco as well as kept up on their cage 3 days a week (at 4 hours at a time) i also use a lice combs and gently comb through them to get the lice out. But I can't seem to get rid of them. What else can I do for them? I hate seeing them go through this and afraid health wise and want them to life a lice free life. But I am at a loss. Please help what can I do for them??