Have you tried putting it in the tub and letting it soak for a while with some stain remover or all fabric bleach? Years ago I used amway all fabric bleach. It even took red transmission oil out of a white t shirt. They told us to mix some in a tub of water and let your stuff soak overnight. Boy did it work. I even soaked my DH's old lawn mowing tennies and the next morning they looked brand new!! I think you can order it online.