Make sure you have set the level of scent to 'HIGH'. It may take a few minutes for the fragrance to be released. Check the bottom corners of the product to see if there are small holes in the foil (which indicates that the scent is being released). If there are no puncture holes, try snapping the clip into place again.

Tress MacNeille is one of the most talented women in the voice-over industry to date.

Crank up the fresh-tensity of your car's air and fight stinks with Febreze Unstopables Fresh CAR Vent Clips - filling your vehicle with airy undertones and crisp, vibrant layers that last up to 40 days.

Fresh in your car with Febreze car vent clips firmly push the clip up until you hear it click in place to activate the scent. Then clip it to your vent for freshness. For up to 30 days just push.

How to Make Your Car Air Freshener Last Longer

1. Clean Your Car More Often. Car perfumes and colognes can seem to lose their scent faster when they are forced to compete with other odours.
2. Unwrap Your Card Air Freshener Gradually.
3. Don't Invert Your Car Oil Diffuser Too Often.
4. Top Up the Scent with Car Spray.

Use a Needle Both Halter and Poepping recommend trying the warm water method first, but if that doesn't work there's another quick fix you can turn to: Inserting a needle into the release mechanism to physically loosen the clog. "This will often do the trick and get you back spraying happily," Halter says.

Arnett's distinctive gravelly voice has earned him voice-over work for CBS television promos, film trailers and numerous advertisements, including Lamisil medication. Perhaps most recognizable is Arnett's voice saying, "It's not more than you need, just more than you're used to" in ads for GMC trucks.

Carvana will feature a married celebrity couple in upcoming ads. Carvana, the used car seller famous for its vehicle vending machines, is launching a national advertising campaign in August starring celebrity couple Kristen Bell and Dax Shepard.

The Bottom Line Overall, the best car air freshener is Febreze Unstopables Car Odor-Fighting Car Freshener Vent Clip. This car air freshener can leave your car smelling fresh and clean for up to 30 days and blocks odors instead of just temporarily covering them up.

No air freshener will last forever, but to keep your car smelling fresh for the longest amount of time, the Clevast Bamboo Charcoal Air Purifying Bags can absorb odors for up to two years, just keep in mind that they don't produce any scent.

If other people can smell your car diffuser, but you can't, you may be experiencing olfactory fatigue (or “nose blindness”). This means you've become desensitised to the fragrance. After prolonged exposure, the brain starts to consider familiar smells unimportant – so they stop triggering your odour-detecting cells.

The Bottom Line Overall, the best car air freshener is Febreze Unstopables Car Odor-Fighting Car Freshener Vent Clip. This car air freshener can leave your car smelling fresh and clean for up to 30 days and blocks odors instead of just temporarily covering them up.