For butter and grease stains use Dawn Dish Soap. This works even after you have let the stain set in and tried other ways of getting it out. Pour soap on the stain and take a wet wash cloth and rub the soap in really good. Then Add more soap and rub some more. Finally put more soap on the stain and place the wash rag on the stain and roll the item up with the wash rag still inside. Place this in the washer and wash with medium warm to hot water.