I actually attach them to the air vents in my house. They work really well to keep my house smelling nice but they only last a week and then they barely work for the reason I bought them. When I use them in my car the same thing happens, they are very strong for a week and after that you hardly notice the smell. But they do the job better than most other home air fresheners (I've tried many). I just have to buy 40 to 50 pieces every 4-6 weeks.
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