I did the same to a top that rested in my MIL's cedar chest for a gazillion years. Let's just say that I would not have worked on it the way it was. I was super careful soaking it in the tub with oxyclean. I rinsed it carefully never agitating, and in the end, mine looks every bit as bad as yours. I don't even want to think about pressing all those seams. SIGH!