Maybe you can help elliefunkhandmade? Over in the Flickr group, she's asking about restoring and cleaning older embroidery pieces:
[...] an advent calendar my grandmother made close to forty years ago - it is very special to me. I was wondering whether anyone had some ideas or tips about how best to wash it. It needs some minor repairs but the fabric has also stretched in places. I don't know for sure - but I think it is all cotton fabric (but I'm not sure of the stitched thread - I assume they are DMC)Here and here are some photos of the calendar.
I'm sure others have the same question/problem, so if you have any suggestions for how to care for older pieces, please share them in the comments. :-)