For example, a couch that smells like a household animal, a stuffed animal having that “grandma” smell, or a carpet peed on and not properly cleaned: it seems like these sorts of smells seep into the object and become nearly impossible to remove economically. You can mask smells with air fresheners, but those usually fade, and they just impart their own opinionated odor to the object. What about odors makes them so inherent to an object over time?
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It is because you are not able to clean it thoroughly. On things with volume, or multiple layers such as a couches or carpet you might only be cleaning the top layer. While the inner layer will still have the stain, smell, as well as bacteria and dust (skin cells, dirt) that the bacteria eat and produce the smells.
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