hello all! came across a few pieces and need some cleaning help with them. first piece up - believe it is devore velvet but please correct me if i'm wrong. it came as a set, blouse with underdress. some signification markings on the blouse, wondering what can be done to remove them? can this blouse be soaked? can the underdress be soaked as well? also, can anyone place a decade to this set? i was thinking 1920s? thanks so much!