We have been emphasizing that wool doesn't really need to be washed. But sooner or later your beloved mid and heavy weight knits will have to go into storage. And when they do, they need to be fresh and clean as this will prevent moths and because nobody likes a smelly drawer, right?
When you decide to wash you better use a dedicated delicate detergent. In order to last longer, delicate fabrics require special care. This detergent is gentle on wool, and the added lanolin works as a conditioner for your clothes - protecting the fibers, and giving the colors extra luster.