I bought some thread on ebay, and the box it came in smelled so bad it permeated the thread. I had some stain and odor solution I had gotten from the pet store that was amazing in eliminating cat urine smell (which is THE worst) so I gave it a try. Sprayed the inside of a clean cardboard box, put the thread in it, tucked in a paper towell sprayed with the solution and closed the lid overnight. ALL gone! I was afraid I had made a major mistake, but all is well. I have bought pre-cut blocks with a tiny piece of low-scent dryer sheet tucked into the zip lock bags, supposedly to absorb moisture, but the material smelled nice. That might help too.