I have been in swaps where the fabric swaps were supposed to be prewashed, and a note in the package said that they were not. One member was in a position that she had to run and buy the FQ's as a family emergency had come up. So she bought and mailed them on the way out of town, so she wasn't late mailing them.
So, I guess if there is a medical reason that concerns you? You may want to choose swaps that the items could go immediately in your washer to get rid of whatever it is you are worried about in the fabrics :wink: :D:D:D