Pour fragrant bath salts into a loose-leaf tea strainer, and place it in the glove compartment for a fast refresher every time you pull out the map.
Get a whiff of wax
Drop a potpourri wax tart— commonly made by candle companies—into a cup holder, and take your favorite scent with you wherever you go.
Dry and drive
Lay fresh herbs, such as basil, on a piece of newspaper in the backseat and leave the windows rolled up to dry the leaves and banish bad odors.
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Shake a few drops of lemon or eucalyptus essential oil onto car mats for a naturally sweet scent that will last a few weeks.