Once your car is clean, you’ll want to keep it smelling fresh in a natural — and thrifty — way. Use essential oils to create an inexpensive, chemical-free air freshener, OneGoodThing suggests. Soak a clothespin in the essential oil of your choice (or put it inside a bag of fresh herbs such as mint or rosemary) and clip it to an air vent once it’s absorbed up the scent. Alternatively, you can make a Mason jar air freshener that fits in a cupholder, or craft a decorative felt-and-foam hanging air freshener that’s infused with a refreshing natural scent such as lemon, mint or lavender.