Wow these replies have been really interesting!
Thanks for all the info.
I will not throw anything away.
Though I am considering what to do with some that had been sprayed with that adhesive stuff. I was feeling ambitious and was going to make a bunch of bags and got a few different fabrics sandwiched. They come right apart. I wonder if I wash them if they will be alright to use in a quilt. I'm over bags. Can't do 3D stuff unless someone is standing over my shoulder showing me every step!