10ml Car Diffuser Comes With Air Vent Clip Duration 15–20 Days Wooden Lid Diffuser Cap Lavender and Geranium is the calming option — herbal lavender softened by the green, faintly rosy character of geranium. Where citrus wakes you up, this settles things down, which makes it well suited to heavy traffic and long motorway stretches. Also the most neutral of the five, so it works if the car is shared and tastes differ. How to Use Unscrew the cap and remove the seal. Replace the wooden lid and tip the bottle gently to saturate it. Hang from the mirror or fit the vent clip — keep it out of direct airflow so the scent releases gradually rather than all at once. Re-saturate the lid when the scent fades. Avoid over-tipping, which can cause leaks. Keep upright when not in use. Wipe spills promptly — fragrance oil can mark interior trim.