Here's what I do: take a large garbage bag and put a bag of kitty litter (the cheap, clay kind with nothing added) inside. Open up the kitty litter bag and then lay a piece of sheeting or something else you don't care about on top. Then lay your quilt, folded over the fabric. Be careful not to get any kitty litter dust on it. Close the bag tightly and let sit for a couple of weeks. You should find the clay absorbs the smell.