Just wash them again and again until it comes out. Don't bleach like someone else said. I'm assuming she thinks it was a poopy diaper. My goodness, I use cloth diapers and I certainly don't bleach my machine after washing my diapers - that's what soap is for :o)
It will come out, I almost did it once myself, lol.
I have sent baby wipes through the wash accidently and surprisingly they came out looking like a fabric softener. I have often wondered, since I'm a green freak, if you could wash your wipes and then recycle them??? I don't worry about it now because I use flannel cloths for the cloth babies and a wet paper towel for the Pampers child. Works just as good with no chemicals.
Mom to 4, soon 5 through another adoption and hopefully more :o)