How to Get Rid of Musty and Mold Smell in House: Causes, Fixes, and Prevention

That persistent musty smell lingering in your home is more than just an unpleasant odor — it is a potential signal that moisture, built-up grime, or early surface mold is settling into your living space. At EuroMaids, we specialize in deep cleaning services in Naperville, and we are here to help you reclaim a fresh, clean, and healthy home environment.

In this guide, we cover what causes that stale, moldy smell, how to eliminate mold smell and mildew odor room by room, and how professional cleaning keeps it from coming back.

What Causes Musty Smells?

Musty smells typically trace back to one culprit: excess moisture. Here are the most common sources:

Mold spores are naturally present in the air but need moisture to form colonies. Once they find a damp surface — soaked carpet, a leaky wall cavity, a humid basement — they break down organic materials like wood, drywall, and fabric, releasing Microbial Volatile Organic Compounds (MVOCs) that produce that characteristic stale, earthy odor. Many people describe it as earthy, damp, or pungent — think wet wood or a musty attic closed up for months — rather than simply dusty.

It is also worth noting that a musty smell can persist even after mold has been physically removed. The odor-causing compounds remain embedded in surfaces, fabrics, and air until they are cleaned out properly.

How to Find the Source of a Musty Smell

Knowing how to get rid of the mold smell starts with locating where it originates. Musty odors rarely come from one obvious spot — they tend to build up in areas that stay damp, poorly ventilated, or out of regular cleaning rotation.

Common places to inspect:

• Laundry areas: Damp clothes left in a hamper or machine are one of the most frequent and overlooked odor sources.
• Bathrooms: Grout lines, caulk, under-sink cabinets, and poorly ventilated shower enclosures trap moisture and develop mildew quickly. A deep bathroom clean can reveal buildup that is easy to miss.
• Basements and crawl spaces: Low airflow and ground-level humidity make these the most common zones for persistent musty odors.
• HVAC vents and ducts: Mold spores that enter the ventilation system can spread musty air throughout the entire home. If you have not had air ducts cleaned recently, this is worth checking.
• Under carpets and behind furniture: Spills, pet accidents, and condensation can soak into flooring and go unnoticed for months.
• Inside walls and concealed plumbing areas: Slow leaks behind drywall create sustained dampness that feeds mold growth without any visible signs.

If a visual inspection does not reveal the source, a moisture meter can detect high-humidity zones that are not yet visible. For suspected structural mold behind walls or in crawl spaces, a licensed mold inspector can assess the extent of the issue.

How to Get Rid of Mold and Musty Smell: Your Step-by-Step Action Plan

Here is how to eliminate mold smell and freshen your home from the inside out.

1. Boost Air Circulation

Open windows and doors whenever weather allows. Run exhaust fans in bathrooms and kitchens during and after cooking or showering. Ceiling fans and portable fans keep air moving and reduce stagnation.

2. Invest in an Air Purifier

A HEPA-filter air purifier removes airborne odor molecules, mold spores, and allergens that routine cleaning may not fully capture.

3. Do a Deep Cleaning

A thorough clean of your home — with special attention to moisture-prone zones like bathrooms, basements, and laundry rooms — is the single most effective way to eliminate musty odors at their source. Fix any leaks or moisture sources before you begin; cleaning over an active moisture problem only masks the odor temporarily.

4. Treat Hard Surfaces with Natural Cleaners

For hard, non-porous surfaces with early surface mildew or odor buildup, white distilled vinegar is one of the most reliable options. Spray it directly on the affected area, let it sit for an hour, then scrub with a sponge and baking soda paste to neutralize the odor at its source. Essential oils such as tea tree or eucalyptus, diluted in water and applied with a spray bottle, offer a gentler alternative with natural antifungal properties.

5. Use Specialized Products for Stubborn Odors

When natural remedies are not enough to fully eliminate mildew odor from surfaces, targeted products can make a real difference:

• Concrobium Mold Control can be applied to hard surfaces to eliminate spores and leave an antimicrobial barrier that slows regrowth.
• 3% hydrogen peroxide applied directly to an affected surface, left for ten minutes, then scrubbed and wiped clean, is an effective and widely available option.
• Borax or diluted bleach solutions work well on tile, grout, and other non-porous bathroom surfaces.

Safety tip: Always wear gloves and ensure the space is ventilated when using any of these products.

6. Clean Fabrics with Baking Soda

Sprinkle baking soda on upholstery, carpets, and rugs. Let it sit for a few hours to absorb embedded odors, then vacuum thoroughly for a noticeably fresher result. For washable fabrics, adding white vinegar or borax to the wash cycle helps eliminate mildew odor that regular detergent alone may not remove.

7. Improve Your Laundry Routine

Transfer wet laundry to the dryer promptly. Damp clothes left in the machine or on a pile are one of the fastest ways to reintroduce musty odors into a freshly cleaned space.

8. Replace Air Filters Regularly

A clogged filter traps musty-smelling particles and recirculates them through your home. Replace HVAC filters on the manufacturer's schedule to maintain clean airflow.

9. Use Natural Odor Absorbers

Bowls of white vinegar or activated charcoal placed in problem areas work quietly to neutralize odors between cleanings — no harsh chemicals needed. Activated charcoal bags are particularly effective in enclosed spaces like closets, under sinks, and in basements where ventilation is limited.

10. Freshen Pet Zones

Pet bedding, toys, and sleeping areas hold odors longer than most surfaces. Wash pet bedding frequently and keep those areas well-ventilated.

11. Control Humidity Levels

Run a dehumidifier in basements and crawl spaces. Keeping indoor humidity between 30% and 50% discourages moisture buildup and the odors that come with it.

12. Make Cleaning a Habit

Regular cleaning is your best long-term defense. Schedule routine sessions for carpets, upholstery, and curtains, focusing on areas where moisture tends to accumulate.

A Clean Home Is a Fresh Home: Keeping Musty Odors From Returning

Knowing how to get rid of musty smell in a house is only half the job. The other half is making sure it does not return. Musty odors and mildew come back when the conditions that create them — moisture, poor airflow, and infrequent cleaning — go unaddressed.

• Ventilate consistently: Open windows and run exhaust fans in bathrooms and kitchens every time, not just occasionally.
• Keep humidity below 50%: Run a dehumidifier in basements and damp areas. This single step does more to prevent recurring odors than most other measures combined.
• Fix leaks immediately: Even a slow drip creates the sustained dampness that allows mildew to develop on nearby surfaces.
• Dry everything completely: After cleaning, ensure surfaces and fabrics are fully dry before closing up a room. Damp mop heads and sponges left in enclosed spaces are a common source of returning odors.
• Switch to sealed storage: In basements and closets, use sealed plastic bins instead of cardboard, which absorbs moisture readily.
• Schedule regular professional cleanings: Regular cleaning keeps moisture-prone areas genuinely clean at a level that prevents mildew from gaining a foothold, not just surface clean.
• Schedule cleaning after mold removal: Even after a licensed remediation contractor clears structural mold, surfaces, fabrics, and air can still carry residual odors. Cleaning after mold removal is a separate step, and one EuroMaids handles specifically to restore your home to a truly fresh state.
• Use mold-resistant products in high-humidity rooms: Paints containing mildewcide add a protective layer against surface mildew and the odors it produces, particularly in bathrooms and laundry areas.

Still Dealing with Musty Smells? Here Is What to Do.

Surface mildew on tile grout, bathroom caulk, or other hard, non-porous surfaces can often be resolved through consistent bathroom cleaning and professional maintenance. If the musty smell persists, EuroMaids' home cleaning in Naperville can help identify and clean affected areas as part of a scheduled visit.

Widespread mold that has spread inside walls or structural materials is a different matter. That requires a licensed mold remediation contractor, not a cleaning company. Once remediation is complete, contact EuroMaids for the post-remediation clean that brings your home fully back to fresh.