My friend (a single dad) gave me a rug which had belonged to his son as a child. It's one of those traidcraft type rugs - you know, woven cotton with a printed design of animals on - really lovely. Thing is, it's minging ! I've put it in the bath in some hot water and washing powder but am wondering how to scrub the stains out (hate to think what they are ) as I'm worried about the ink running. No washing instructions on it! Any thoughts?