How to get rid of mould from walls, ceiling and bathroom

Jul 5, 2021


Firstly, what on earth is mould and mildew?

Mould and mildew are both forms of fungi that are commonly found in homes. Mould is a type of fungus that consists of multiple similar nuclei and develops in black or green patches. The fungus breaks in underneath the surface of the affected material. On the other hand, mildew is a specific type of mould with a flat growth pattern, and it remains on the surface only, which makes it easier to remove.


Why do mould and mildew occur on walls, ceilings and bathrooms?

Moulds and mildew are considered part of the natural environment, and they reproduce with the help of tiny spores that float through the indoor and outdoor air and cannot be seen with the naked eye. Mould usually starts to grow inside the home, particularly on walls when mould spores land on surfaces that are either wet or have moisture.

Is mould removal easy?

It’s tough to get rid of mould and mildew as they spread very easily, and are capable of living on various types of surfaces. However, it is important to remove these fungi before they cause health problems and structural damage to your property.

How does mould affect your health?


You will most likely experience allergic reactions, such as sneezing, throat irritation, a runny nose, and skin rash and irritation if you have uncontrolled mould in your house. This is because these microorganisms are known to produce allergens as well as irritants and toxic substances. If mould and mildew are not controlled, they may even cause permanent lung damage in some individuals.

Keep reading to find out how you can remove mould on your walls.


Why do I have mould on my walls, ceiling and bathrooms?


We all know that the cause for mould growth in the kitchen and bathroom is constant humidity from steam, whereas most of us are unaware of the reasons that contribute to the growth of mould in bedrooms. Below is the list of possible causes of mould growth on the walls in your bedroom:

  • Humidity: Humidity is the number one cause behind the growth of mould on the walls of the bedroom. If you are living in a humid area, your walls are vulnerable to fungi. Humidity can also be caused due to poor ventilation in the bedroom.
  • Condensation: Condensation is a natural phenomenon that usually occurs on cooler walls than the air present inside the house. The water present in the air can experience a fall in temperature when it gets in touch with the walls. This temperature drop causes a state of change into a liquid. If the liquid stays on the walls for a long period, the walls become an ideal surface for mould growth.
  • Water Leaks: This is the 3rd most common reason contributing to mould growth on the bedroom walls. If there is an internal leakage of pipes, it is most likely that the water will make its way into the wall, increasing its moisture. The moisture builds up with time and becomes an ideal spot for mould growth.

Signs of mould growing in your walls and ceilings:


Moulds usually start with just a tiny spot, but it grows rapidly. The colour of mould can be black or white or greenish, and its appearance is mostly powdery, cottony, or velvety. Following are the signs of mould growth:

  • It has a stale, earthy odour.
  • It must be near some source of moisture where the light is not much.
  • The material on which it is growing is likely to experience warping, peeling, or cracking.
  • If you put a drop of bleach on it, its colour will be lightened within a minute or two.
  • Mould tends to grow with time as opposed to the dirt or old stains on the surface.

Equipment you’ll need to get rid of mould from walls and ceilings: 

The following equipment might be required during and after the removal process:

  • Scaffolding: A ladder or scaffolding is required to reach areas that are high such as ceilings.
  • Vacuum: It is required to vacuum the surface before and after the process of mould removal.
  • Dehumidifier: Once the mould is removed, it is recommended to use a dehumidifier to remove any moisture in the air.
  • Fans: Fans can be beneficial in letting the air out of the room; the air may contain any mould spores. Fans are also helpful to dry any wet areas.

Materials you will need to get rid of mould:

The following materials are required to remove mould from the walls and ceilings:

  • Stiff bristled brush.
  • Cloth
  • Chlorine bleach
  • Water

Wear protective clothing

It is advised to wear protective clothing such as a plastic biohazard suit before the mould removal process starts. Also, do not forget to wear masks, gloves, and goggles to protect your hands, face, and eyes.


How to get rid of mould in 6 easy steps:

Step 1: The first step is to wear protective gear and clothing.

Step 2: The second step is making a solution of chlorine bleach and water. The solution must have three parts of water and one part of chlorine. You can alternatively use a household detergent that has bleach as an active ingredient.

Step 3: With the help of a stiff-bristled brush dipped in bleach water, thoroughly scrub the area of mould growth.

Step 4: Properly rinse the area with the help of cloth and water.

Step 5: Let the area completely dry with the help of fans.

Step 6: Use a dehumidifier to remove excess moisture from the air and help maintain the ideal humidity level.


Does bleach kill mould?

Bleach can be used to remove traces of mould on hard and impermeable surfaces such as tubs or tile. On the other hand, the mould growth on porous surfaces such as wood cannot be killed by bleach because mould penetrates deep into porous surfaces. Therefore, even if you use bleach to wipe the mould away, it will grow again from underneath the surface in a minimal period.


Do commercial mould cleaning products get rid of mould?

Yes, commercial mould cleaning products work as they consist of chemical agents that kill microorganisms and can restrain the growth of mould. In addition, commercial products are specifically made to remove mould from porous surfaces. However, they are not meant to remove the stains that mould build-up may have left behind.


When to call in the professional mould removalists?

It is advised to call a professional to remove mould in the following scenarios:

  • When you cannot figure out the mould growth or moisture problem, you can smell mould.
  • When there is a huge amount of mould that cannot be treated easily.
  • When there are people in the home who have serious health problems such as asthma or allergy or there are people who have a fragile immune system. Mould can cause serious health issues in those people, so it is advised to call a professional in those situations.
  • If other hazardous materials such as asbestos or lead are most likely to get disturbed upon removing the mould.
  • If the excessive moisture has led to structural problems.

How to prevent mould from growing back on your walls and ceilings?

It is essential to take the precautions necessary to avoid mould from coming back or growing on your walls, ceilings and bathrooms.

  • Make it a habit to open windows daily for a certain amount of time to increase the ventilation. Additionally, make sure that your air vents are not blocked.
  • If there are no windows, then it is advised to turn up the thermostat for ventilation.
  • Fix any leakages as soon as they are discovered.
  • Do not dry laundry inside your house; however, if it isn’t feasible, you should consider investing in a dehumidifier.

How does a dehumidifier get rid of mould?

Dehumidifiers are perfect for preventing mould from growing in your home. The mechanism used by the dehumidifier is pretty simple and below are the 5 five steps that best describes the mechanism:

  • The dehumidifier comes with a fan that pulls in the air from the bedroom.
  • The dehumidifier then cools the air inside to condense moisture into water.
  • The water is then separated from the dried air, and the separated water is put in a separate segment.
  • The dried air, which now has very little moisture, is re-released into the room.
  • Once the desired humidity level is achieved, the dehumidifier will stop, or it will also stop if the water section is full and cannot hold any more water.

How to use a dehumidifier for mould removal:

Before going into the details of using a dehumidifier, please keep in mind that different dehumidifiers have different capacities, which is why it is essential to buy the dehumidifier by the size and humidity level of your room. Once you have the dehumidifier, follow the steps to use it:

  • Locate the dampest area of your house and set up the dehumidifier there. Each dehumidifier comes with a manual, which would help you to set it up.
  • Once the dehumidifier is set up, it is time to set the ideal level of humidity that you want to achieve. The ideal humidity level is considered to be somewhere between 40% and 60%.
  • At this point, it is important to note that normally the dehumidifier removes more humidity in the first few cycles than later cycles. This is because, in the beginning, it will remove excess water that has already built up in the air over some time, while once the excess water is removed, it will remove less amount of water required to maintain the ideal humidity level.

About Miracle Maid

miraclemaid.com.au is an on-demand home cleaning services platform that instantly connects you with a community of highly experienced house cleaners in Sydney.

Unlike a standard cleaning company, Miracle Maid is centered around peace of mind, quality assurance, and giving back to our planet.

Click below to explore our services:

Want to speak with us?

Our dedicated customer support team is here and always happy to help.