ivermectin

I have a boy who has, unfortunately, contracted mange mites. I gave him a round of oral paste moxidectin, but it didn't work. It's occurred to me that I may need to mix the moxi like crazy to make sure he's actually getting enough of the active ingredient, but I'm a little worried to try again...

Recently took my 2 month old male rat to vet for pinworms and lice. Treated him and my 4 other boys with prescribed ivermectin liquid 1mg/ml diluted w/ 9mL of veggie oil. One more treatment 10 days from now. I've washed all fleece with hot water cycle and vinegar and dried on higher heat...