I have a white quilt!
I want to share with you what I did. I did look online for RetroClean that several of you recommended. It is available at WalMart but I didn't find it on the shelf at my local store. I resorted to what I had on hand. Therefore--Dawn to the rescue!
I used hot water in my washer and a generous 1/2 c of Dawn. Sloshed it around pretty well with intent to let it soak "indefinitely" but the manufacturer of my machine thinks they know more than I do about operating the thing so it wasn't long that I found it drained! So I filled it up again and put Biz in this time. This application went through a usual cycle on delicate and then I washed it with my usual detergent and it came out like it had never been so ugly.
I am thrilled! I hope the woman who did all of the cross-stitching is looking down on it and is as pleased as I am. It is beautiful. Unfortunately I have never posted pictures here and don't know how. Just trust me, this worked!