Wash something in woolite sometime after you get it back from the dry cleaners. You'll be amazed at how much filth you get out of it. Personally, I like to know that the gunk on my kilts is my gunk and not from the last hundred items that were "cleaned" in the same fluid.

To each his own, but I swear by the Kathy Lare method of hand washing in woolite and laying flat to dry. I use an old patio screen door w/ fiberglass screen. This preserves the lanolin and other oils in the wool, prevents excessive felting and is quite easy.