Can't find the dosage for using Adams fleas shampoo for lice. Some say follow directions on the bottle which I think is two to one. Some say a weak solution like a capful per five gal bucket. Big difference in those dosages. Can someone set me straight? I'm out of sevin and had good luck with the shampoo last year but can't find that thread with the correct water/shampoo ratio. Can anyone help me out with this? Thanks .