If you're someone who ends up sweating buckets by the end of the work day, you know for a fact that your car absorbs all of that body odor and locks it in. Car odors come from many different factors, such as food that was left in a crevice between the seats and left there for awhile. This, among body odors, creates a smell that can be extremely unkind to the nasal cavities. This also goes the same for pet owners who constantly have their dog, for example, in the car with them. You may not notice the smells that come out of your car very often, but your passengers sure do.