If our desired sunshine happens tomorrow, make sure to open your shades, blinds or drapes and let the sun shine in as this is a good deterrent for mildew or mold growth which can cause a moldy smell throughout your home.  Good air flow throughout the home also inhibits mold and thereby curtails any odors from such.  Have you ever had someone pull out a pair of shoes from a closet only to find that they are covered with mold? Or, how about that smell of mold in books from a back room. This could have been due to a lack of air movement in that room or closet. Allow ventilation by keeping doors to rooms and closets open. Forced air systems generally keep air movement flowing; but, if that is not the case in your home, you may want to install fans with timers to accomplish the same thing.

It could be that the odor you are detecting in your home isn’t from mildew or mold.  The odor could be coming from traps under sinks or in showers that haven’t been used for a while. This allows sewer fumes in the home and the smell is “not nice.”  Keep the traps full of water and possibly add mineral oil to slow the evaporation if these pipes aren’t going to be used any time soon. *