If you've got a smelly car, you don't exactly want to advertise it. But that's what you're doing when you dangle one of those little trees from your rearview mirror. This Car and Office Scent Diffuser ($40) is far more subtle. Just plug it into your car's USB or DC outlet and it will cover up that old gym clothes/ancient spilled latte aroma with the far less offensive fragrance of your favorite essential oil.
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