essential oil car air fresheners

• Open the air freshener bottle and remove the small plastic stopper underneath the cap if your model includes one.
• Pour the witch hazel or vodka into the bottle. I've found using a small funnel helps. The witch hazel/ vodka should fill around 2/3of the bottle. Since most air freshener bottles are 12ml, 8 ml is a good estimate.. I've even tried vodka, which has also worked well and may even last a bit longer due to its lower alcohol content (meaning slower evaporation).
• Fill the rest of the bottle with an essential oil of your choice.
• Put the wooden cap on the bottle without the plastic stopper. Tip the bottle over to wet the cap with the alcohol and essential oil mixture.