This collection is absolutely wonderful. You might be able to take away the 'old house' odor by putting them in the dryer with dryer sheets and one or two damp hand towels. I have a dress with a mola on it and it goes through the wash very nicely. However, I would consult an expert before considering washing your project after you make it. You can find a qualified person by contacting a quilt museum such as the one in Lincoln, Nebraska. They have a lot of helpful information.