The answer to 'why is my hardwood floor grimy' is that it's likely due to a buildup of dirt, dust, and debris over time. Hardwood floors can become grimy for a few common reasons: lack of regular cleaning, using the wrong cleaning products, or not properly maintaining the floor's finish.
Symptoms of a grimy hardwood floor include a dull, cloudy appearance, visible dirt and grime, and a rough or sticky texture underfoot. To fix this, you'll need to thoroughly clean and restore the floor's finish. This may involve sweeping, mopping, and potentially refinishing the floor if the finish is severely worn.