Our car diffusers are made by mixing pure essential oils or premium fragrance oils with a solvent. The fragrance is dispersed via evaporation of essential/fragrance oils into the car. Remove the plug from the neck of the bottle, secure the lid and tilt the bottle so the cork is saturated to give a strong-smelling car aroma. Make sure to keep the car diffuser upright as spillages may damage some surfaces due to the volatility of essential oils. We use Augeo diffuser base which is non-toxic, low in carbon footprint and low in odour, giving it a superior performance.