Lanolin is a naturally occurring wax secreted into the wool fibers by sheep. It is cleaned out of the wool during processing the fibers for fabric. Pure pharmaceutical grade lanolin, no stinky barnyard smell. Lanolin conditions the wool fibers and gives the waterproof protection we love about wool. It also gives wool it’s anti bacterial propreties to help your diaper cover self clean between uses and naturalize urine. Use Bumby emulsifying blocks to emulsify the lanolin and then soak your wool in the bath. Full instructions to be found below. You can also use the “dry method” which is done by rubbing a small pea sized amount between the fingertips and rubbing it into the wet zone of the cover.