The second principle in odor control is to _________ the source area.

The second principle in odor control focuses on the importance of cleaning the source area to effectively eliminate odors. Cleaning the area can help remove the contaminants that contribute to the odor, as many unpleasant smells are caused by substances such as smoke residues, charred materials, or organic matter. By thoroughly cleaning the source area, you can reduce the chances of odors lingering and help restore the environment to a more acceptable state.

While other options may have their own merits in different contexts, the primary and most effective strategy in dealing with odor issues is through direct cleaning. It ensures that underlying sources of the odor are addressed rather than just masking them or applying temporary solutions. Cleaning eliminates odors at their origin, making it a fundamental step in any restoration or remediation process involving smoke and fire damage.