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What exactly is mold and why do they occur on walls?

Mold is a kind of fungus that develops from airborne spores. It usually grows in damp, warm conditions without much airflow, which is why household bathrooms and loft spaces often suffer from mold. It is often simply caused by humid conditions and lack of ventilation, but sometimes mold on walls can be due to plumbing leaks, both inside and outside the property. Badly insulated heating pipes can also cause a build-up of moisture behind the walls.


Dirty bathrooms are a huge turnoff for home buyers. Mold is another huge turnoff. And if you've tried cleaning this stuff, you know it's well impossible.  

What are the common types of mold?

1. Black Mold
Greenish-black in colour and grows in conditions where there is an excessive amount of moisture over a long period of time. Water damage, excessive humidity, water leaks and condensation in small, damp places like bathrooms make a perfect breeding ground for black mold. Black mold releases mycotoxins, a substance that can cause serious harm to humans and pets, depending on the particular species of mold. A rule of thumb should be "use caution' when removing all molds, especially when in abundance.

2. Green Mold
Green mold is very common in houses and appears in damp areas such as on shower walls and damp corners. The green mold may first appear as dark spots on certain areas in the house. However, if the first signs of mold are not removed immediately, they can develop into a fuzzy layer. If you disturb the surface of the green mold, especially the darker one, you will see spores flying. There is also typical musty smell that accompanies the mold.

3. White Mold
White mold is often found in cool, damp environments such as in basements on walls and other structures. Some mold may appear white at the early stage of their growth but change color with age. The reason is, with some mold the color we see is actually the color of the spores. However, there are times when efflorescence is mistaken for white mold.
How to distinguish between white mold & efflorescence? Efflorescence is a white salt deposit commonly seen on concrete floors. The easiest way to distinguish white mold from efflorescence is to put some of the stuff into a drop of water. If it dissolves, it is not mold. As efflorescence is crystallized salts, it breaks into a very fine powder if squeezed between fingers.

Places Most Prone to Mold

  • In the shower and bathtub
  • The sink and toilet
  • In the walls, on the ceiling and floor
  • Air Ducts

How To Control Moisture?

Too much humidity in the air can also lead to problems in soft furnishings and carpets by causing unseen mold. That extra moisture will cause serious illnesses long before you discover it. Excessive indoor humidity can also rot wood trim and furniture and make paint bubble and peel.

  • Use fans - Run the bathroom fan for 15 minutes after your shower will remove humidity from the bathroom's air. 
  • Dry up any condensation to reduce the potential for moisture forming from condensation.
  • Use a dehumidifier (Olee Premier Aqua Dehumidifier) to remove excess moisture from the air.

    Remove Mold From Painted Walls

    Step 1: Assess The Condition Of The Wall

    • Assess the condition of the wall and extent of the severeness.
    • If the wall has been compromised, e.g. crumbling, there is a need to replace it.
    • If the wall is structurally sound but covered with mold, remove the spots with a cleaner (Selleys Rapid Mould Killer) and some scrubbing.
    • *If mold is in excessive amount, it is recommended that you call a professional to have it removed. 

    Step 2: Prepare The Area

    • Protect the surrounding surfaces, e.g. flooring, from any kind of spills that may cause damage if you are using bleach or mold-killing chemicals.
    • Cover the floor with plastic drop cloth  and tape them in place
    • Old towels could also be used to catch accidental spillage.

    Step 3: Start Scrubbing & Cleaning

    • Gloves are recommended to be used before coming in contact with bleach.
    • Bleach can be used to kill mold, when combined with hard scrubbing.
    • Mix one part bleach with three part of water in a bucket.
    • Scrub the mold-affected wall with the bleach/water solution until the mold spots have disappeared.
    • For tough-to-clean mold-infested areas, consider using both a formulated mold remover and a bleach/water solution to get the job done.

      Step 4: Use a Mold & Mildew-Proof Interior Paint

      • Mold & Mildew-proof interior paint enhances and protects moisture-prone areas in your home to prevent the growth of mold and mildew. 
      • Ideal for use in bathrooms and wet rooms
      • Durable and long-lasting finish


      Clean Moldy Shower Caulk

      If your shower has some nasty looking caulk in the shower, it's time to clean it with ease.

      Items You Need:

      1. A mixing bowl
      2. Bleach
      3. Baking Soda
      4. Disposable paint brush
      5. Masking tape

      Step 1: Prepare the cleaning solution

      • Mix bleach and baking soda in a bowl until it has the consistency of a pancake batter
      • Make more than you think you'll need

      Step 2: Apply the cleaning solution to the moldy caulk

      • Use the paintbrush to apply the bleach paste on the caulk.

      Step 3: Cover the cleaning solution with plastic 

      • Covering the cleaning solution with plastic will help to keep the bleach from drying out. 
      • Let the paste sit for about 10 minutes, and then your sink will look brand new when you rinse the bleach off. No scrubbing required.

      Step 4: Clean up

      • Use water to wash off and clean up the mess. And there, it's going to be sparkly white again.

      This entire project takes about 20 minutes of work, without the need of elbow grease etc. Make sure to use the bleach in a well-ventilated area, and do not breathe the vapors, etc.

      For easy cleaning and save the hassle of shopping for multiple items, you can consider getting the DIY Mold Removal Starter Kitwhich contains the necessary items that you need for a project you've longed to do.

      3 Responses

      Plumbers Hastings
      Plumbers Hastings

      October 30, 2020

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      hospitality supplies
      hospitality supplies

      September 28, 2020

      It’s a great source of knowledge; I think it will be helpful for lot of people who are looking for learning more about the do you know how to remove mold in your home. Thank you very much for sharing this article.

      Christie Sterners
      Christie Sterners

      August 05, 2020

      Good post… This always important for me and everyone. Thanks for sharing details with us.

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