First, unscrew the cover of the car cologne diffuser and remove the inner stopper of the bottle before securely screwing the cover back on. Then, tilt the bottle upside down for around 10 to 15 seconds to allow the wooden diffusing lid to absorb the cologne oil thoroughly. You can then adjust the string to your preferred height and hang the car cologne diffuser upright in your vehicle to exude a luxurious aroma as you drive.