Periwinkle blue Gianni Binni XL Mini dress

Periwinkle blue Gianni Binni XL Mini dress. long sleeves. gathered at the wrist. very well made heavy material dress. it has 3 spots on it which are shown in the photos. I don't know what the stains are. it isn't my dress and I didn't know they were there when asked to sell. I washed it, but didn't use stain remover.