"I am not a big fan of the scent-portables for the car because I've tried multiple different fragrances to use for my car, and with each one, the fragrance is only noticeable for a couple days. Afterwards it's like I never put one in my car in the first place. I love the Winter fragrance so I thought I'd give it a try.......Same thing. You can lightly smell it for the first couple days, and then; nothing. Sad that these aren't made stronger/last longer."