Car freshies are scented air fresheners made to release fragrance gradually inside a vehicle. Many are made from an absorbent material that holds fragrance and then releases it over time as air moves around it and temperatures change.
Unlike a spray, a freshie provides ongoing fragrance without needing to be reapplied every time you get in the car. The strength can vary with the weather, placement, vehicle size, and fragrance itself. Always follow the maker's directions for hanging and placement, especially because car interiors can become extremely hot in direct sun.
A common style is made from fragrance-loaded aroma beads fused into a decorative shape. Other products sold as freshies may use different materials, so appearance alone does not tell you exactly how one is constructed or whether it can be refreshed.
A freshie does not need to visibly shrink or disappear to be used up. The decoration can stay intact after its noticeable fragrance fades. Treat it as a scented product with a useful fragrance life, and check its condition and performance rather than waiting for the shape to change.