Why Does My House Smell Musty Even After Cleaning? If your house smells musty even after cleaning, the problem may not be dirt. Hidden moisture, crawl space humidity, water damage, poor ventilation, or mold inside HVAC ducts can cause persistent odors. Check out this blog to understand the common causes of musty smells and practical ways to find and address the source. Visit here: https://kcconstructionandrestoration.com/house-smells-musty-even-after-cleaning/