Odor Removal requires a lot of common sense. It amazes me that professionals still think they can eliminate odors by shampooing and spraying a deodorizer. Nothing is farther from the truth.
Many odors are caused by micro-organisms such as bacteria, mold and mildew. Not only does shampooing not eradicate these odors, it spreads them over a much wider area! You must kill odor-causing organisms BEFORE you clean.
What is an Odor?
At a basic level, an odor is a gas you can smell. Since the gas is not the source of an odor, an adsorbent carbon filter, baking soda, a time-released deodorizer or vapor product, etc. will only work temporarily to mask or clear the air. Even if you were able to replace all of the space with fresh air, the odor will return if you haven't removed the source.
What is the Source?
The odor source may be residue from urine, feces, spoiled food spill or tobacco film. Odor sources require different treatments. You might need an oxidizer, disinfectant, biocide, odor counteractant, neutralizer or enzyme. As you can see, it is paramount to locate and identify an odor source before you attempt to remove it.