Taffeta Wedding Dresses

This gown was professionly cleaned & stored in a "Preservation Box" layered with blue tissue and sealed. It was also put into a heavy plastic bag. It was stored in a closet and never opened until my daughter came home to try on for her wedding. The stains are on the front of the dress and are quite large. (12X12) I don't know what they are, but the dress didn't have these stains while worn 44 years ago. The cleaners said they can't remove the stains. My daughter wants to get married in my dress. PLEASE HELP ME!
Thank you to all who gave me advise on my problem. I tried the Oxy Clean but it didn't work as well as an old standby that I used, to get stains out of my children's bibs. 1 part Clorex color-safe dry bleach & 1 part dry dishwasher detergent. It worked great. The stains are gone & the dress is really white now.