Mold needs to be dealt with quickly once you have noticed it on your windows and window sills or casings. Once mold has taken hold in your home it can quickly transfer to hard to clean spots where it can multiply quickly. Black mold can be highly toxic to you and your family. It can get into your walls through tiny cracks and grow inside the home where it can get into the HVAC system and spread around the home. Removing mold is tough once it has spread so as soon as you notice you need to act fast and clean the affected area.

Our team has seen quite a number of windows with black mold while providing service across Toronto. It can be a serious problem when left unchecked. Before you go out looking for replacement windows, read on to discover how to remove black mold and save yourself thousands of dollars.

How Does Mold Get On Window Sills?

Mold spores can be deposited on your windows, sills and casings when the wind blows. Once the spores are on the windows or the frame moisture from condensation and the heat from the sun can cause it grow quickly. Having potted plants along the window sill can also cause black mold growth if you don’t carefully clean the areas around the pots.

How To Get Rid of Mold & Mildew

Cleaning up black mold is a little more involved than cleaning regular dirt off of your windows. Don’t bother with the old baking soda & vinegar trick, that’s not going to work here.

If you suspect a serious mold problem, call a professional. If you’re dealing with a bit of mold near your window sill you can get away with a DIY clean up. Make sure you don’t breathe in any of the mold spores. You should wet the area completely before you start cleaning to prevent spores from kicking up. Getting the mold spores wet will keep them from flying off into other areas of the home or into the air where they might be breathed in by your family or pets. If you have a HEPA air purifier place it near the area where you are working to keep air is clean. Make sure that all kids and pets are safely out of the area before you clean the mold.

Before you take on black mold you need to make sure that have a few things:

  • Face mask / dust mask
  • Safety goggles
  • Rubber gloves
  • Spray bottle with clean water
  • One or more; microfiber cloth, scrub sponge, paper towels (use something you don’t mind throwing out)
  • Bucket for cleaning solution

Once you have your safety equipment ready to go; mix a mold removal cleaning solution:

  • Warm water
  • Bleach (or white vinegar)

The water will loosen the grip of the mold on the window so that you can remove it and bleach (or white vinegar) will kill any mold spores in the area. If you’re using bleach you’ll want to mix a solution using about a cup of bleach with a gallon of water. Just remember, do not mix bleach with other cleaning supplies as that can cause a dangerous reaction.

Clean the area

  1. Make sure the area you’re working in has plenty of fresh air and good ventilation. Turn on the exhaust fan in your bathroom if that’s where you are cleaning. Turn on your HEPA air purifier as well to help maintain air quality.
  2. Spray the affected area with the clean water.
  3. Using your microfiber cloth, dip it into the cleaning solution and soak the affected area thoroughly.
  4. Use a soft steel wool pad or scrub sponge to loosen all the mold. If you are cleaning mold off a window sill or casing, a small foam brush is a fantastic tool to use to clean mold off window sills and casings. The small size of this brush makes it easier to kill hard to reach mold.
  5. Let the window and the window sills dry with the bleach mixture still on.
  6. Spray the window and the window sills down again with water.
  7. Rinse the window and sills with plain hot water. Clean off the water with paper towels or an absorbent cloth.
  8. Make sure that any towels, sponges, or clothes you used to scrub the mold go into a sealed plastic bag instead of directly into the trash. That way the mold can’t spread to your trash can.
  9. After you have rinsed everything down with hot water turn a fan on the window and sill to dry it or use a hair dryer to dry it. Make sure it’s totally dry.

Mold needs water to grow so making sure the window and sill have no water anywhere near them will prevent mold from growing again. If the mold is very stubborn you may need a stiff bristled brush to pry the mold off the window or the sills. Just make sure that you remember to always wet the area before scrubbing so that the mold spores don’t fall into the house. And never remove your mask or respirator.

Once the window and the sills are dry you shouldn’t have any more problems with mold. But you might want to apply a wood sealer to the wood window frame or paint over it to prevent any mold from growing in the future.

How To Remove Mold From Exterior Windows & Window Casings

You might find your exterior windows have mold on them. It might be on the glass, sills, or window casings. We recommend hiring professional window cleaning company to take care of this task. They will use a fungicide on the window itself to prevent the growth of mold and to prevent mold from blowing into the house from an open window.

Professional cleaning of interior windows can help eliminate mold growth too. If you have a respiratory condition like asthma or allergies you should contact a professional window cleaner. This will stop the mold from triggering an allergies or asthma problem. Professional cleaning once a year is strongly recommended for all homeowners.