In my experience all they need is fresh air, it can take time but the smell does eventually go, if you put the items out side to air. The nepthaline breaks down in oxygen. Nepthaline is nasty, as it breaks down it vapourizes and gives off a gas which is dangerous to breath in. It can also enter the blood stream just by handling the product, ok in very small doses, I would be careful just the same, I'd go for the airing outside option if it were me.
Gal