Wow! Sounds like your group needs to clean their own house... That being said I have seen on this board where double-knits were great backings b/c they are warm. I can't imagine wanting to make wall-hangings as donation quilts so if the fabric cannot be washed, it is not useful to your cause. I also think it might be time to make guidelines for people who are hoping to donate fabric to your group. This will prevent future discussions. Donors could be suggested other venues to donate fabric/table clothes/sheets etc. I realize that does not solve the issue at hand now but maybe it would help your group define what they do actually want to do when fabric/goods are donated to them.