One of the things I like to sell on eBay is old snowmobile suits. Over the years now I have had several that have this "Barnyard" smell to them. At first I thought the previous owner must have been a farmer but now realize it must be something used in the manufacturing back in the 70's. I have a ladies John Deere jacket and bibs with the tags still on but has that smell and pretty strongly at that. I have hung them outside for several days and used Frebreze but that didn't seem to help much. Anything else I can try?