What will your car smell like with a Farmhouse Cider Car Diffuser? There's nothing better than the tart, tangy sweetness of a cup of hot cider with a splash of orange and just a touch of cherry. If you love the smell of cider cooking in the winter, this diffuser is for you! How to use: When you are ready to use the diffuser, take the wooden lid off. Remove the plastic plug out and discard, replace the wooden lid. The wood from the lid pulls the oils and that’s how the scent diffuses. Car Diffuser lasts 6-8 weeks in the summer and longer in the winter.