Originally Posted by MTS
I soaked 30 year old hand embroidered blocks in a small tub using BIZ detergent. I left them in there for a few hours and was AMAZED at how clean they were - or, actually, how filthy they really were.
Rinsed them thoroughly and laid them out on a towel to dry.
All ready to use in a quilt. When I get around to it!
This is what I would suggest too. As for the biz it could be any soup, just make sure to wash it very well afterwards.