How to Clean Mold off of a Ceiling (Plus Prevention Tips)

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The best ways to get rid of mold using bleach, vinegar, and more

Co-authored by Mike Kapur and Hannah Madden

Last Updated: August 15, 2023 Fact Checked

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Killing Mold

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Eliminating the Source of the Mold

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Video

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Expert Q&A

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Tips

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Warnings

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You glance up at the ceiling one day, only to find that you’re staring at black, brown, or green spots up there. What the heck are those? These spots, which are likely mold spots, are common, especially in damp, dank areas (like your bathroom or your kitchen). It’s important to get rid of mold right away to avoid any damages to your home or your health. Fortunately for you, we’re here to help! We’ll walk you through all the steps to killing mold and getting rid of the source to prevent it from coming back.

Things You Should Know

Use white vinegar, bleach, borax, or hydrogen peroxide to make a mold cleaning solution.
Spray the solution onto the ceiling, then scrub it into the ceiling with a scouring sponge.
Let the ceiling air dry all the way to avoid any other mold growth.
Eliminate mold by using a dehumidifier and repairing any leaks in the roof.

Method 1

Method 1 of 2:

Killing Mold

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1
Look for green, brown, or orange mold spots on your ceiling. Usually, you’ll be able to spot mold on your ceiling from far away. Check for other indicators too, like cracked or peeling paint, discoloration, recurrent black streaks, bulging and/or a musty, damp smell.^{[1]
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Research source}
- Examine the material used to construct the ceiling, too. If your ceiling is made of a porous material (popcorn ceiling, wood, drywall, etc.), the mold cannot be killed and will likely come back later. You will have to remove the affected portion of the ceiling and replace it.^{[2]
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  Expert Source
  
  Mike Kapur
  Certified Mold Assessor & Home Inspector, Sonic Home Inspections
  
  Expert Interview. 19 August 2020.}
- Mold is different from “ghosting,” another phenomenon that can cause discoloration in your ceiling. Ghosting typically follows the pattern of the framing in the attic, and the discoloration is caused by dirt or soot sticking to the ceiling.
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Stand on a footstool or stepladder to reach the mold. As you clean, it’s important to stand on a sturdy surface that won’t slide around. Use something with non-slip or rubber feet, or place your stool on a non-slip mat.
- If you have really tall ceilings, use a ladder instead.
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Wear gloves, a mask, and eye protection. Gloves will protect your hands from the cleaning agent and from the mold. Use a mask and eye protection to keep your lungs and eyes protected from fumes and splashback.^{[3]
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- Eye protection is extra important when cleaning mold off of the ceiling. Since you’ll be looking up, there’s a chance that cleaning product could drip down onto your face.
- Put on old clothes that you don’t mind getting a little dirty.
4
Remove mold with vinegar, bleach, hydrogen peroxide, or borax. There are many natural solutions that you can make to clean mold and clean it up quickly. Choose one of these solutions and mix it in a large bucket to clean your ceiling with:
- White vinegar: Pour undiluted white vinegar into a spray bottle.^{[4]
  X
  Research source} White vinegar is a natural cleaner that will sink into the drywall, cleaning mold from the surface and the inside of the wall.
- Bleach: Fill a bucket with warm water, then add 1 c (240 mL) of bleach for every 1 US gal (3.8 L) of water.^{[5]
  X
  Research source} Keep in mind that while bleach removes mold from surfaces, it does not fully kill mold inside the drywall.
- Hydrogen peroxide: Pour undiluted 3% hydrogen peroxide into a spray bottle.^{[6]
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  Research source} Hydrogen peroxide is an antifungal and an antibacterial that kills and removes mold.
- Borax: Fill a bucket with water. Add 1 cup (240 g) of Borax for every 1 US gal (3.8 L) of water, then mix thoroughly.^{[7]
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  Research source} Borax is a natural cleaning product that does not emit dangerous fumes.
5
Spray the cleaning solution onto the mold, then let it sit for 10 minutes. Pour your cleaning solution into a spray bottle, then spray a liberal amount of it onto all of the mold that you can see. Let the solution sit for about 10 minutes so it penetrates into the ceiling.^{[8]
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- As you spray, be careful to watch for drips. Many cleaning solutions can cause skin irritation, so wash your skin off right away if any gets on you.
6
Scrub the mold using the rough side of a scouring sponge. Rub back and forth to shift the mold off. Take breaks as needed, especially if the mold patch is large. You may also need to get down and shift the footstool to reach all parts of the mold growth.^{[9]
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- As you clean, take regular breaks to rinse the sponge off. If you don’t, there’s a risk that you’ll spread the mold around rather than remove it.
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Let the ceiling dry fully. Mold thrives in a wet environment. Open up any windows and point fans at the ceiling to ensure that everything dries all the way.^{[10]
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- This is especially important for bathroom ceilings. Bathrooms tend to harbor a lot of moisture, which can exacerbate mold.
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Sand down the ceiling and repaint it with waterproof paint. If your ceiling is discolored or you plan on repainting the ceiling then you should sand down the ceiling. Sand the areas where the mold was covering to remove any lingering traces and provide a good base for the new paint.^{[11]
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Expert Source

Mike Kapur
Certified Mold Assessor & Home Inspector, Sonic Home Inspections

Expert Interview. 19 August 2020.}
- Waterproof paint is ideal, since it helps stop mold from coming back.
- Sanding and repainting is a good idea if you want to keep mold away for good. If you’re fine using other preventative measures and cleaning your ceiling regularly, then you don’t need to do these steps.

Method 2

Method 2 of 2:

Eliminating the Source of the Mold

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1
Hang up towels in another room. Wet towels can add humidity to a room. Make sure you hang your towels to allow them to dry thoroughly, preferably in another room. Do this to keep humidity at a minimum, reducing the conditions for mold growth.^{[12]
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- Avoid drying clothes indoors on racks or over chairs if you have a mold growth problem. Excess moisture from drying clothes can encourage more mold growth.
2
Use a dehumidifier. Mold prefers damp and warm conditions. Dehumidifiers remove the humidity from the air, reducing the ability of mold to grow and thrive.^{[13]
X
Expert Source

Mike Kapur
Certified Mold Assessor & Home Inspector, Sonic Home Inspections

Expert Interview. 19 August 2020.} Set up a dehumidifier and keep it on any time there’s moisture in the air, like after a shower.
- Be sure to clean your dehumidifier regularly to avoid mold and mildew buildup.
3
Repair any leaks in the roof. Most ceiling mold comes from water moving through a leaking roof. Head up to the attic or the roof and look for holes where water might get in. Then, call a professional to come patch them up.^{[14]
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- This may sound like a lot of work, but unless you eliminate the problem, the mold will just keep coming back. Eventually, water damage could eat through your ceiling.
4
Use fans and windows to ventilate the room. Bathroom and kitchen ceilings often develop mold because of inadequate ventilation. Use fans or extractors in the room to move water out quickly, especially when taking a shower or cooking.^{[15]
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- Some extractors can be installed by yourself and some will need to be professionally fitted. Speak to a representative at your local hardware supply store to see what kind of extractor will suit your room.
5
Expose the ceiling to sunlight. Mold prefers to grow in dark conditions. Discourage mold from growing by opening your windows or blinds to let the sunshine in. If there aren't any windows around, add some additional lighting to the area, which will also add heat and reduce the growth of mold.^{[16]
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Join the Discussion...

How do I safely kill mold?

17

WikiCheetahRunner104

I think I found some mold in my bathroom recently and am a little worried. I know mold isn't good and stuff like black mold can be pretty dangero... Read More

Mike Kapur
Certified Mold Assessor & Home Inspector, Sonic Home Inspections

You can use vinegar, diluted bleach, ammonia, or pretty much any household cleaners that have some kind of moldicide in them. If you have mold in... Read More

WikiAxolotlDancer711

I agree that household white vinegar is the way to go! Make sure to give it time to soak if you want to maximize the effectiveness of the vinegar... Read More

See all 3 Replies and

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Question

What would cause mold on ceilings?

Mike Kapur
Certified Mold Assessor & Home Inspector, Sonic Home Inspections
Mike Kapur is a home inspector and the owner of Sonic Home Inspections, a home inspection company in Westchester, New York. With over 15 years of experience in pre-inspecting properties, Mike specializes in mold, radon, asbestos, lead, water, and air quality testing as well as hazardous materials, pest, infrared, and general home inspections. Prior to founding Sonic Home Inspections, Mike worked pre-inspecting apartments. Mike holds a BS in Accounting from Queens College and is a Certified Mold Assessor in the state of New York.

Mike Kapur

Certified Mold Assessor & Home Inspector, Sonic Home Inspections

Expert Answer

When hot air rises and cools off quickly, this leaves moisture on the ceiling that allows mold to grow. Investing in quality insulation can help prevent this from happening.

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Can mold in your house make you sick?

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This answer was written by one of our trained team of researchers who validated it for accuracy and comprehensiveness.

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Staff Answer

Mold is more likely to cause problems if you have allergies or asthma. Most commonly, you might notice a runny nose, difficulty breathing, coughing or sneezing and you should limit your exposure to the mold if you have any of these symptoms. Reactions more severe than this are rare. Typically, a small amount of mold is not very dangerous.

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If the mold is on drywall, does it need to be replaced?

Community Answer

It depends on how deep the mold has grown. If you can, use a wide spackling knife and scrape the paint, and if no mold shows at the lower layer, then you do not need to replace, just clean off the mold. However, if you find no end to the mold, it is likely feeding on the drywall and the drywall needs to be removed completely.

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Tips

Always clean mold as soon as you discover it. This prevents the situation from becoming dangerous and/or causing permanent damage to your house.

Thanks
Helpful 7 Not Helpful 2
Test the cleaning solution on a small area of the ceiling to make sure it does not damage the ceiling.

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Make sure you find the source of the mold and solve the problem before you begin cleaning. Otherwise the mold will simply grow back.

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