Leave bowls of cat litter, white vinegar, or coffee groundsall of which neutralize smellsin the drawers or compartments of a dresser or wardrobe. "Activated charcoal is also a powerful absorbent that's sold in little bags in organizational and home stores," says Warberg Block. "It works by trapping odors in little catacombs, eliminating them naturally." We like the Moso Bamboo Charcoal Bags (from $10, containerstore.com). Or, try EarthKind's Stay Away Moths Pouches ($26 for 4, earthkind.com), which are filled with absorptive corncob and cedar wood, and fragrant essentials oils like rose and citronella; these can both reduce the odor and keep the pests away.

Together, they can lift unwanted aromas from wood. If you can, take the piece outside on a sunny day and remove any drawers. "The heat will speed up the sublimation process, turning any remaining mothball particles into gas that can drift away," Warberg Block says, "and the ventilation of an outdoor or garage space will keep it from settling into other soft surfaces in your home." If the item can't be moved easily, try opening the windows in the room where it's located and aiming a blow-dryer or space heater at it (from a safe distance) for 15 to 30 minutes daily for up to three days. For this approach, wear a face mask to minimize inhalation of the fumes."

I didn't copy/paste the last suggestion, as the above applies to wooden furniture but should be applicable to a car interior, but here it is:  "If the above strategies don't work, your last resort is to lightly sand all of the item's exterior and interior surfaces"

Another site suggests leaving baking soda, like the little fridge packs you can buy in your grocery store, inside to absorb the odours.

Sounds like leaving it outside on hot sunny days with the windows down would pretty much do the trick, but I don't know how long it would take to get rid of the smell.  I haven't seen mothballs in years... and I'm not talking about the ones on moths, as I've never actually looked for them.