I found a post dealing with stains. Actually, if you go up to serch then type in stains, several post from this forum come up.
This is a quote from sy on one of the posts.
Hi, A friend of mine deals in old quilts. She put Biz in cold water in a bathtub. Lets it soak over night then wrings them out by hand . Lets it dry naturally..then if the stain are not gone . She will try it one more time. if it will come out it usually does then .
Hope this helps. :-) :-)
Sorry, it's not the one about baking soda and vinegar.