I would wash them with a soap or somethign without any lanolin in it first, and then relanolize. I always do a two step wash, I just have a hard time believing they get really clean by just soaking in a lanolin rich wash, they need to be cleaned first imo. Baby shampoo or I like to use Kookaburra9I think it has a tiny bit of lanolin, but not a lot). I once washed a pair of longies in Kookaburra that I thought was permanently stained, but the K got out SOOOO much dirt. they looked new again after a couple of soaks in the K. That's what prompted me to do the 2 step wash routine from then on.