On a trip through Costco, I was near the laundry stuff and a woman told me that she puts a tablespoonful or so of those scent pellets you toss in the washer in a snack or sandwich size ziploc bag then stab a few holes in it then throw it under your car seat. I did that maybe a couple months ago, and it still smells GREAT. Fwiw I use the Gain Strawberry scent, but any of 'em work. Obviously you can vary the scent by adding or reducing the pellets, and adjusting how many times you stab the bag.
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