1. Open the wooden cap, add 3 drops of oil ONLY. (If you fill to top the sun will make it evaporate , and/or it will leak on interior of car when you hit bumps.)
2. Screw the wooden cap .
3. Tip the bottle upside down for 1 – 2 seconds so that the fragrance absorbs into the wooden lid. Do not over saturate with oil.
4. At this point you may hang diffuser in car or if you choose to use the plastic stopper included, unscrew the wooden lid and place in the stopper.
(NOTE if you use stopper you will need to take out every time you want to refresh your car.)