Dang YOU are so lucky!!!
I love the old linens!!
Soak stained linens in Oxyclean.
Be sure it is well dissolved first.
I had an old piece that I took to a professional fabric restorer-- not sure of his correct title. He works with fabric thousands of years old for Chicago museums and he said the Oxyclean is similar type process to what he uses.
That's a great endorsement for me!!