I found an old panel that I had left in a box where the box actually had mold inside and out. Luckily, none on the fabric. I washed it and the smell was worse because it smelled like mildew and laundry detergent. Left to hang and dry and it smells fine now. Beware the cats though. Pumpkin slept on a pile of fabric that had that smell (it was waiting to be washed) and my cat smelled like cat and mildew! ROFL...don't know which smell I like least...hehe!