O.K. I think I finally figured it out (for myself). For years and years, I've aired the items out for a couple of weeks first. That usually works. I've also found that washing the chemicals first only makes them worse. It must activate the chemicals, etc. ............ However, lately, I found this to work quite well, as strange as it sounds: After airing the item out for a week or two, wrap the item in clean newspapers. Make sure that the newsprint is placed inside the item, too. Wait a week or more, and most of the strong chemicals will be absorbed. .......... Now, I don't recommend doing this with white or off-white, or light-colored items unless they are completely casual/washable fabrics. You don't want newsprint marks on silky, expensive fabrics. And, my experience tells me that most light colored items don't have that strong petroleum odor, anyway. Well, that's about it for now. Lots of good luck. If the odor doesn't dissipate in three weeks (after airing it out), then I suggest returning that item before the 30-day return expires.
'More or less', 'Right or wrong', 'In general', and 'Just thinking out loud ' (as usual).