Febreze launched CAR Vent Clips in February. It's designed to help eliminate odors from your car, not just hide them. The clip releases a fresh scent for up to thirty days - and it's designed to be continuous, not overwhelming and then gone. If you're having problems with odor in your car, check it out! It's available nationwide in midnight storm, meadows & rain, linen & sky, Hawaiian aloha, and Thai dragon fruit.
Disclosure: I received a Febreze sample kit to facilitate this review.