We've only had them about a week; We have one for two cars. They were easy to install. Our cars didn't really stink; We tend to keep them clean, but the ads were attractive, so we gave them a try. I agree with other reviews that the smell is very strong; We turned it all the way down, and it's pretty strong when the door is open. The nose adapts (or dulls the feeling) and after a while it becomes imperceptible. Our cars are semi-compact, four-door. I would definitely NOT use them in a smaller enclosure (like a truck cab). Advertisements claim that they eliminate odors, but in reality they only appear to mask odors with fragrance. The design is good, I have no plans to buy it again and will not recommend it.
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