4 DIY Steps On How To Clean Mold From Window Sill Easily

Using D.I.Y cleaning materials like baking soda or white vinegar is the best way on how to clean mold from window sill. Your windows get exposed to so much moisture; that’s why mold usually grows here.

The infestation is minimal most of the time, so you don’t pay too much attention to it. However, leaving the fungus unattended can be risky for your loved ones, especially if it’s black mold. You might develop respiratory problems from inhaling the spores, so it’s best to clean your window sills as soon as you see dark marks. 

how to clean mold from window sill


How Do You Know There’s Mold?

Mold usually starts growing at the bottom of your windows. The first things you will notice are dark spots on the sill.

Sometimes, the mold matches the wood color, so it’s harder to spot. The smell can also be an indicator that a colony is forming.

Treat every dark mark on your window sills with caution. Catching the mold early on can make cleaning more straightforward.


Causes Of Mold On Window Sills

Mold comes from a moisture source, and you must pinpoint that source to clear out your infestation effectively. Bathroom and kitchen windows are the most susceptible to mold because they are exposed to much liquid. Keep your eye open for issues that can cause water damage to your window sills:

  • Leaking roof
  • Damaged window frame
  • Leaking pipes
  • Moisture from the tap or shower for bathrooms
  • Steam from cooking for kitchens
  • Faulty ventilation or heating system
  • Lacking airflow

Leaking appliances can also lead to mold. The largest leaking risk to your sills is a window air conditioner. 

The mold which forms inside this appliance can also spread to your windows if not attended to. Here’s an article that will help you deal with mold in window air conditioners


Products That Can Remove Mold

Now you need to remove the mold from your window sills since you’ve fixed the leaking source. Several home products can kill mold effectively. Here are the best solutions:


Tea tree oil

This essential oil can kill mold at the roots. It’s harsh on the fungus but safe for human skin. Mix a glass of water with ten drops of tea tree oil for the best cleaning solution. 



Vinegar’s acidity makes it perfect for killing mold. Spray the vinegar on the mold and leave it for an hour. Scrub off the mark and wipe it clean for a mold-free window. 


Baking soda

This powder is another famous D.I.Y. cleaning agent. Mix it with vinegar for a more potent cleaning.

Other products like borax, ammonia, and bleach can remove stains. However, they won’t kill the mold at the roots, and it will result in repetitive work for you.


Step-By-Step Process On Removing Mold From Window Sills

It’s essential to act fast once you spot mold to prevent it from spreading too much. Follow these tips to get rid of black mold to have clean window sills.


Step #1. Get your materials ready

You will need an old toothbrush, the D.I.Y. cleaning agent of your choice, and safety clothes. Always wear a mask, goggles, and gloves to protect you from fumes and spores. Cover the floor under your window so the spores won’t contaminate it. 


Step #2. Scrub the area

Use the old toothbrush to spread your cleaning agent, and scrub the area well until the mold comes off. 


Step #3. Wipe your windowsill

Use a damp cloth to clean the area. Continue scrubbing and wiping until you’ve removed all the mold.


Step #4. Leave the window to dry

Once you’ve finished cleaning, leave the area to sun dry or place a fan to speed up the process.


Mold Growth Prevention On Windows

Now that you’ve cleaned off the mold, it’s time to prevent it from growing back. Here are some points that can help you prevent mold growth.


1. Install exhaust fans

These fans can help with proper ventilation. Your kitchen and bathroom should have exhaust fans to prevent mold spores from settling. Always make sure your fans are in good condition, and they ventilate the room properly. 


2. Use air conditioners and dehumidifiers

Air conditioners are best for hot weather because they help balance the humidity in a room. Dehumidifiers can regulate the condensation that forms during winter. These appliances work well for reducing moisture but make sure they are in good condition and there aren’t any leaks. 


3. Keep your rooms ventilated

Open your windows and curtains so air can flow around. A simple five-minute break can improve the air quality in your room. 


4. Keep the window sills clean

Even though there isn’t any mold, develop a routine to clean your windows so spores can’t grow.


5. Use mold-resistant paint

Some store-bought materials can do wonders for mold prevention. Mold-resistant paint can prevent fungus from growing, and it comes in many colors to match your house. Just remember to keep children and pets away from the paint when it’s drying. 



Mold can be a huge problem, especially when it’s in an accessible area like your window sills. The spores from black mold can cause severe health issues, so you need to clean up right away.

You can keep your house clean and your family safe when you know how to clean mold from window sill. Use simple cleaning agents that will save you money and time!

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