Can't smell unless it's right under your nose.
I just bout some of these at a grocery store and it says they are supposed to last 60 days. I used one of the clips and the first day you couldn't even smell it. I asked my wife if my car smelt different and she couldn't smell anything either, I then told her and showed her that I had these on my vents. I used to get the tree hanging version and those were way better. I finally used 2 of the clips on a different vent and you can kind of smell it now, but its very faint. I would recommend the tree version of this but not the vent clips.
Rating: 1 stars