Hanging Car Diffuser!! Keep your car smelling and look wonderful with our Car Freshener . You can choose from our variation of fragrances and colors. This 8.5 ml diffuser comes filled with your favorite fragrance and lasts around 2 months, depending how much you like to release the fragrance at a time. Instructions: Remove the plug from the diffuser and allow the fragrance to pull up into the bamboo top. The strength of the fragrance is up to you, you just need to tip the bottle and enjoy the amazing aroma of your chosen fragrance.