The Strangest Places Mold Can Grow In Your Home


A clean house is important for keeping it free from mold. Even if you clean regularly, mold can still show up in places you wouldn’t expect, like kitchens, bathrooms, and laundry rooms. It likes moist, dark areas with poor airflow.

Mold isn’t just gross; it can also be harmful to your health. It spreads fast and can cause allergies, especially for people who are sensitive to allergens or have weak immune systems.

To keep everyone safe and your home mold-free, you need to know where to look for mold, how to get rid of it, and how to stop it from coming back. Here are thirteen surprising places where mold can hide and how to deal with it.

At the bottom of your toothbrush holder

One of the most unexpected places where mold can lurk in your home is at the bottom of enclosed toothbrush holders. These seemingly innocuous containers provide the perfect environment for mold growth due to their enclosed nature, which traps moisture and creates a humid environment.

As toothbrushes are often damp when placed back in their holders after use, any residual water can accumulate at the bottom, creating a breeding ground for mold and mildew.

The lack of airflow in these holders further exacerbates the problem, allowing mold spores to thrive and multiply unnoticed.

To prevent mold from taking hold in your toothbrush holder, it’s essential to regularly clean and dry both the holder and your toothbrushes. Ensure that the holder has drainage holes to allow water to escape and air to circulate, reducing the risk of mold growth.

Underneath door mats and other rugs

Another surprising location where mold can thrive in your home is beneath front door mats and other rugs. While these mats trap dirt and moisture from shoes, they can also become breeding grounds for mold.

Put Soft Material On The Floor

Water from wet shoes, rain, or snow can seep through the rug and accumulate on the floor underneath, creating a damp environment ideal for mold growth. The lack of sunlight and airflow in these areas can worsen the problem, allowing mold spores to multiply unnoticed.

To prevent mold from flourishing beneath your rugs, it’s crucial to regularly inspect and clean both the rugs and the floor underneath.

Consider using moisture-resistant rugs or mats with rubber backing to minimize moisture absorption. Allow wet or damp rugs to thoroughly dry before placing them back on the floor, and consider using a dehumidifier in areas prone to high humidity.

Cabinets near your sink, dishwasher, and exhaust vents

Despite being enclosed spaces, these cabinets can become hotspots for mold growth due to frequent exposure to moisture and humidity.

Leaky pipes, splashes from sink usage, and steam from dishwashers or hot showers create the perfect conditions for mold spores to flourish.

The lack of adequate ventilation in these areas can exacerbate the problem, allowing moisture to linger and mold to thrive unseen.

Regularly inspecting and cleaning these cabinets, ensuring proper ventilation, and promptly addressing any leaks or moisture issues can help prevent mold from taking hold.

Your refrigerator and freezer drip pans that catch leaks and food spills

The drip pans of your refrigerator and freezer are designed to catch leaks and spills, but they can also be mold hotspots. These pans often go unnoticed and unchecked for extended periods of time, providing an ideal environment for mold growth.

Drips from condensation, as well as spills from food and beverages, can accumulate in these pans, creating a damp and dark environment where mold spores thrive.

Since these areas are seldom cleaned, mold can proliferate unnoticed, potentially contaminating nearby surfaces and affecting the air quality in your kitchen.

In your coffee maker

Despite its daily use and seemingly clean appearance, coffee makers can harbor mold growth in various hidden crevices and components. The moist and warm environment created by leftover water and coffee grounds provides an ideal breeding ground for mold spores.

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Plus, the dark and enclosed spaces within the machine, such as water reservoirs, tubing, and filter compartments, can further facilitate mold growth.

Failing to clean and properly maintain your coffee maker can not only affect the taste of your morning brew but also pose health risks due to mold contamination.

Regularly cleaning and descaling your coffee maker, along with allowing all components to thoroughly dry between uses, are crucial steps to prevent mold growth and ensure the safety and quality of your coffee.

Your mattress

Sadly, seemingly dry mattresses can actually accumulate moisture from sweat, body heat, and humidity over time.

When this moisture becomes trapped within the mattress, especially in areas where airflow is limited, mold can grow. Be warned that if the mattress is placed directly on the floor or in a poorly ventilated room, the risk of mold growth increases!

Since mold can exacerbate allergies and respiratory issues, it’s crucial to regularly rotate and ventilate your mattress, use a breathable mattress cover, and ensure proper ventilation in your bedroom to prevent mold.

Your house plants

While houseplants are often valued for their ability to purify indoor air, they can also inadvertently harbor mold growth, especially in the soil and on the surface of the pots.

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Overwatering, high humidity levels, and poor airflow around the plants makes it easy for mold to grow. That, plus organic matter, such as decomposing plant material or accumulated dust, can further contribute to mold growth on the soil surface.

Look at your houseplants for signs of mold once in a while and allow the soil to dry out between waterings. Keep plants in a place with good ventilation to minimize mold.

If you discover mold on your houseplants, quickly remove any affected plants from areas with other houseplants to prevent the spread of mold spores.

Trim away any visibly moldy or decaying parts of the plant, including leaves, stems, or flowers. Dispose of the removed plant material in a sealed bag. As a last resort, you can use a commercial fungicide labeled for use on houseplants to control mold growth.

Babies’ and children’s toys

Mold can be found on the outside or inside of babies’ and children’s toys. Firstly, toys often come into contact with moisture from saliva, spilled drinks, or exposure to humid environments, providing an ideal breeding ground for mold spores.

In particular, toys with porous materials, such as fabric or foam, can absorb moisture and organic matter, creating conditions conducive to mold growth.

Furthermore, if toys are not properly cleaned and dried after use, any residual moisture can promote mold development over time.

The dark and enclosed spaces within toys, such as seams, crevices, and battery compartments, can also trap moisture and facilitate mold growth, especially if airflow is restricted.

Given that children frequently put toys in their mouths, mold contamination on toys can pose health risks, making it essential to regularly clean and inspect toys for signs of mold to ensure the safety of young children.

Old shoes

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Well-worn shoes can inadvertently harbor mold growth, especially if they become damp or wet and are not thoroughly dried between uses.

The dark, warm, and often humid environment within the shoes creates an ideal breeding ground for mold spores.

And dirt, mud, and sweat that accumulates on the bottoms and in the soles of shoes provides nutrients for mold growth. Regularly cleaning and thoroughly drying your shoes, especially after exposure to moisture, is essential to prevent mold.

Water-based and preservative-free beauty products

Water-based and preservative-free beauty products are popular because they’re natural and safe for sensitive skin.

But, without those additives, these bottles are prone to mold. Even products with preservatives can develop hidden bacteria over time. This means that all-natural formulas might get grimy, especially if you’ve been using them for a while.

The scary thing is, using a product with mold on it can cause irritation or an allergic reaction on your skin or hair. To prevent this, store your beauty products in a dry, cool place like a closet instead of a warm, humid bathroom.

Remember, products also have expiration dates, which are estimates of how long they’ll stay effective and safe to use. If you notice mold, throw the product away and get a new one, even if it’s not past its expiration date, to avoid any health risks.

On the ceiling

When thoroughly cleaning a home, it’s important not to overlook the ceiling. Ceilings are just as prone to mold as other parts of the house, especially when there are leaks or high humidity levels.


Before addressing the mold itself, you need to find out where the moisture is coming from. Check your roof, upstairs appliances, or nearby air ducts for any signs of water damage.

If you can’t fix the issue on your own, it’s worth hiring a professional contractor to help. Once the root problem is solved, you can remove the mold in two ways. If you have tile ceilings, you can replace the affected tiles with new ones.

For conventional ceilings, cleaning is simpler. You can hire a professional or use a long-handled mop with a mixture of bleach and water to scrub the mold off. Make sure to wear protective eyewear while working overhead to prevent any mold or bleach from dripping into your eyes.

On or beneath wallpaper

Traditional paste-on wallpaper is making a comeback alongside other maximalist trends, but it’s not the best choice for homes with poor insulation or ventilation. In these conditions, mold can grow between the wallpaper and drywall, making it hard to spot.

Moldy wallpaper might have discolored or misshapen spots and a musty smell. It can also cause flu-like symptoms for you or your family.

Start by checking for gaps in insulation and making sure your HVAC system works well. If you find mold, you can clean it with warm water and mild soap for minor cases, but for severe mold, it’s best to call a professional.

If mold keeps coming back, consider painting the walls instead of using wallpaper, especially in humid areas like kitchens and bathrooms where mold thrives. Wallpaper is a better choice for dry climates and rooms like bedrooms, dining rooms, living spaces, and offices.

Between the folds of a washing machine door gasket

It’s common for washing machines to develop mold because they’re often exposed to water and humidity. Check the folds of the rubber gasket inside your washer door, as mold tends to grow there due to trapped moisture.

To clean it, mix one part bleach with three parts water in a spray bottle, but make sure your laundry room is well-ventilated first.

Open windows and doors or use a fan to avoid inhaling fumes. Spray the bleach solution on the door, seal, and gasket, then let it sit for a few minutes before wiping it off with a clean cloth.

This should get rid of the mold and keep it from coming back for about a month. To prevent future mold growth, clean your washer with bleach or run a sanitizing cycle about once a month.

In between window panes


Mold on window glass can sometimes happen when air gets trapped between two window panes, often due to condensation. This occurs when warm indoor air meets the cold window glass, causing moisture to form.

To prevent this, ensure proper ventilation in bathrooms by using extractor fans and wiping down wet surfaces. Using a dehumidifier can also help remove excess moisture from the air.

Maintaining a consistent temperature in your home can further control condensation levels, as rapid temperature changes create moisture, providing an ideal environment for mold growth.

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