I have a black cotton/ nylon Jasper Conran dress which I washed following a funeral. It’s come out with grey stains - almost like watermarks. Dress was washed in hard water area with persil non bio/ no fabric conditioner and dried flat on an airer. Is it salvegable? Should I take it to the dry cleaners and see if they can do anything/ dye it? It’s a lovely dress - nothing else has come out like it. Photo of the label and how it’s come out ( photo looks a lot worse than real life)