The answer to 'hardwood floor odor' is that there are several common causes, including moisture, spills, pet accidents, and mold or mildew. Symptoms can include a musty, unpleasant smell that may worsen over time. Solutions depend on the cause, but may involve cleaning, drying, or treating the affected area.
For minor odors, homeowners can often address the issue with DIY cleaning and odor removal methods. However, for more severe or persistent odors, it's best to call in a professional cleaning technician who can properly diagnose the cause and recommend the most effective solution.