Car Diffusers are a best seller! These car reed diffusers not only look adorable clipped onto your vents but give a long-lasting fragrance throughout your vehicle. Each diffuser will last about 30 days depending on weather. Arizona Monsoon is a nostalgia scent for those that love the fresh smell of rain mixed with the sweet and savory creosote bush. A perfect mix of creosote, cactus flower, rain water, and damp earth.