If it's pretrol smell from some kind of fiber in the product it will air off. I don't think it can be washed out, it just takes time, a year or two (seriously). You can't seal it in plastic or pack it away, it will preserve the smell as well as the fabric. It's very annoying fabric are meant to be like that? The same for moth balls, which often is myrrh or cedar. It will air off, but it takes more than a day and you can't expect it to go away after 4 hours in the sun. I thought a dry cleaning would though. My grandparents had a chest lined with myrrh wood. It didn't smell bad at all, neither did the clothes or blankets kept in there. Some mothballs on the other hand often needs a good airing out.