Refreshing Car Diffuser Ingredients Lemon, Orange, Mandarin, Peppermint and Bergamot Pure Essential Oils Suitable for Car Office or Home filled with pure essential oils top quality blending. To release the fragrance unscrew the wooden cork, remove the plastic cap out of the bottle and replace the wooden cork inside. Tip the jar upside down for few seconds to get the fragrance in contact with the cork. Do that every time you need to refresh your fragrance. Last 2-3 months, depends on use.