How To Remove and Prevent Mould from Grout Lines

Remove and Prevent Mould from Grout Lines
(The Simple Step by Step Guide)

Unfortunately, there are always a few areas in your house, such as the kitchen and the bathroom, that are highly susceptible to mould growth. Since these rooms are often wet and have limited ventilation, they become mould’s favourite place to grow.

The immediate effect of mould growth is that it makes the tiles look shabby and old. Secondly, it poses a health threat to your family as mould causes several infections.

Thus, it is essential to remove the mould from grout lines and, more importantly, prevent it from coming back.

Prevent and Remove Mould from Grout Lines

What You'll


Below you’ll find 7 simple to follow steps that ‘walk’ you through how to Remove and Prevent Mould from Grout Lines (with no experience or special skills required).

How to Clean Mould from Grout?

Mould in grout is not an uncommon sight, considering most people do not clean their bathrooms often, practically inviting mould to live there. If you have been careless, there is no need to worry as mould is removable.

You will have to get some elbow grease and time in there, but your bathroom will be mould-free with a few applications of the homemade solutions we mentioned below.

So, we will discuss a few ways in which you can remove mould from grout by using household cleaners.

Apart from being budget-friendly, these methods are also easy to follow, so let’s get into more detail.

How to Clean Shower Grout Mould?

No one wants to shower in a space that has mould growing in it. It’s not only icky but also potentially harmful to your health.

A quick and easy way to get rid of mould is to use warm water. Keep in mind that this method will only work if the mould is still fresh and has not blackened yet.

Here are the materials that you need for this method:

  • Warm water
  • Bucket
  • Spray bottle
  • Tile brush
  • Baking soda

Firstly, try to clean with just water. If it does not work, you can add some baking soda later.

If you are using a microfiber cloth rather than a brush, wear gloves for protection. Then, follow the steps given below:

  1. 1
    Fill a bucket with warm water.
  2. 2
    Take a spray bottle and fill it with the water.
  3. 3
    Work with small sections of the mould at a time. Spray some liquid onto a section of the mould.
  4. 4
    Using the tile brush, scrub the area vigorously.
  5. 5
    If water does not seem to be working, add three parts of baking soda to one part of water.
  6. 6
    Apply this paste to the mould and let it sit for about two hours.
  7. 7
    After that, respray the area with warm water and scrub.
  8. 8
    Rinse with clean water to get rid of any residual.

Even after the mould is gone, the grout might not have its original white colour. Use a bleach pen to restore the white colour of the tiles.

Alternatively, you can make a mixture of baking soda, water, and vinegar for whitening the tiles.

How to Remove Black Mould from Grout?

Black mould has a characteristic slimy texture, grows in circles, and appears as soot on a dry surface. While mould often grows in a sheet-like fashion, black mould forms dots rather than having a consistent spread.

If mould has turned black, this is an indication that it is old and has penetrated its roots well into the tile.

In simple words: this is bad news.

Things You Need

You’ll need a more potent cleaning agent to get rid of black mould in shower grout. Bleach proves effective in removing mould from shower grout as it breaks up the mould and weakens its roots.

Here are the materials you need for this method:

  • Chlorinated bleach
  • Water
  • Sponge or microfiber cloth
  • Brush

Getting Prepared

Since you’ll be working with bleach, wear gloves to keep your skin protected. Bleach also emits fumes, so open any windows and doors in the bathroom for ventilation.

Chlorinated bleach is an eye irritant, so do not touch your eyes while working with it.

Also, do not take too much time while cleaning as extended exposure to bleach can harm the respiratory tract.

Black Mould Removal Steps

Once you’re prepared, follow the given steps:

  1. 1
    You can buy a bleach solution for removing mould from growth. However, if you are making a solution at home, mix three parts of water and one part of bleach.
  2. 2
    Pour warm water on the tiles before using this mixture. Warm water increases absorption.
  3. 3
    Wet the mould in shower grout with this mixture. If mould is growing in the tiles grout, use a Q-tip or brush to wet the area.
  4. 4
    Start scrubbing the mould with a brush. Scrubbing helps in removing the organic growth of mould and breaking it down.
  5. 5
    Instead of scrubbing large areas at once, scrub in small sections as this is more effective.
  6. 6
    Once you have removed the mould, go in with a sponge and rinse the grout lines with clean water.
  7. 7
    If the mould is stubborn, let the bleach solution sit for 2 to 3 minutes. Do not let it stay too long as it can damage and discolour the tiles.
  8. 8
    Use the microfiber cloth to dry the tiles.

Keep In Mind

Keep the windows open even after you’re done cleaning to let any residual bleach fumes escape. Also, do not use any liquid other than water to make a bleach solution.

Never make the mistake of mixing two toxic cleaning solutions, such as bleach and ammonia, as this can damage your tiles and health.

How to Remove Mould from Grout? Alternative Methods.

If you do not want to use bleach due to its harmful properties, you can use other things, readily available at home, to clean shower grout mould.

Here are the alternative things you can use:

  • Hydrogen peroxide
  • Salt
  • Baking soda
  • Vinegar

As you can see, most of these things are already present in your kitchen. Therefore, before you head out to buy bleach, try to remove mould from shower grout using these things first.

Using Diluted Vinegar

Vinegar is not just for your salad dressing as it also helps in removing mould from the grout lines. As vinegar is acidic, it can damage or even break your tiles.

So, do a patch test first.

Apply a small amount of vinegar to the tiles to check if it causes streaking or discolouration.If it does not affect the tiles, it’s safe to use.

Make a solution of white vinegar and water by mixing one part each.Spray this solution to the mould and let it sit for five to ten minutes.Then, scrub the area with a brush or a sponge to get rid of the mould.

Using Baking Soda

If the vinegar alone is not doing any good, its action can be supplemented with baking soda.

Make a paste of water and baking soda by sprinkling baking soda in a glass of water until the mixture thickens. Then,apply this paste to the tiles. After that, spray vinegar mixture on it.

In a few minutes, you will see bubbling on the tiles. Don’t worry; it’s perfectly normal. Scrub the tiles after three minutes to remove the mould.

Note: Do not use baking soda too often on the tiles as it is abrasive.

Using Hydrogen Peroxide

Just like vinegar, hydrogen peroxide can also damage some tiles, so do a patch test first.

If the tiles are unaffected, go ahead and spray them with hydrogen peroxide. Let it sit for five to ten minutes.

Scrub using a brush, sponge or microfiber cloth to get into the mould’s pores and break it up completely.

Using Salt

When it's not busy flavouring your food, salt is fighting mould. You can use regular table salt to clean mould from grout.

Wet a dishrag or a washcloth and sprinkle salt on it. When it gets damp, put it on the grout lines and let sit overnight.

In the morning, scrub the region and rinse it with water.

This method only proves to be useful when the mould has not completely invaded the area.

Think of it as the first-line defence. While it might not do much against older mould, it can break down fresher mould, preventing its further growth.

How to Prevent Mould in Grout Lines?

If you think about it, you wouldn’t have to wage war against mould using your household cleaning supplies if you prevented its growth in the first place.

No one wants to spend their weekend killing fungus. We certainly don’t. Instead, there are many things you can do to prevent mould in the grout lines.

Proper Ventilation

When mould finds a damp, unventilated spot, it starts living there. Thus, you should keep your bathrooms ventilated to prevent it from growing under the sink, in the shower, or the tiles.

After showering, open the windows so that the excess moisture can escape. If the moisture remains in the room, it will settle in the grout lines or the walls, inviting mould for habitation.

If you are not showering, keep the shower door open. This ensures proper airflow inside the shower.

Unfortunately, mould does not only grow in the bathroom. It can very easily settle in your basement or attic while you are putting off cleaning these rooms for months.

So, make sure to ventilate your attic, garage, and basement regularly.

Open the kitchen windows after cooking to let the steam out. Even better, turn on the exhaust fan if you have one.

Keeping Dry

As mentioned earlier, mould loves moist places. So, an effective way to prevent its growth is to keep the bathrooms and kitchen dry.

For this purpose, use a dry cloth to wipe the walls after you shower or cook. Sometimes, even after opening the windows, some moisture might settle on the walls.

Therefore, keep the walls, grout lines, and sink in the bathroom dry at all times.

Also, dry your shower curtains after showering so that mould does not find a home there.

When wet towels are left hanging in the bathroom, they add to the moisture content in the room. So, take your wet towels out of the bathroom with you and dry them before hanging them inside.

Clean Regularly

There is nothing less exciting than cleaning your bathroom, but this does not mean ignoring its cleanliness completely.

If the bathroom is not cleaned regularly, the tiles will get covered in soap residuals. Over time, this soapy texture forms a layer on the bathroom floor, providing a porous surface for mould to thrive.

Use a mild tile cleaner or warm water to clean the tiles regularly. Lightly scrub around the grout to ensure that mould does not grow there.

Anti-Mould Solutions

Busy bathrooms become easy breeding grounds for mould as moisture is present at all times. If this is the case in your home, just cleaning might not keep the mould away.

Spray the tiles with an anti-mould solution once a week. You can buy a ready-made solution or make a natural one at home.

Mix vinegar and water in a spray bottle, in equal proportions., and use it to clean the floors and shower tiles every 5 to 7 days. Or, you can make a mixture with ten drops of tea tree oil in a spray bottle filled with water.

Keep it in your bathroom and use it as an after-shower mist for the tiles.

Alternatively, you can keep certain house plants in your bathroom that prevent mould growth. Moreover, certain paints resist mould growth.

If you are building your home or repainting it, consider using such paints to minimize the chances of mould growth.

Timely Repairs

One of the leading causes of mould in grout lines is untimely repairs. If a faucet or showerhead is broken, get it repaired immediately.

That’s because water from a leaky faucet keeps dripping onto the tiles and increasing the bathroom or kitchen moisture content.

Along with wasting water, this also provides suitable conditions for mould to grow.

When Should You Call a Professional?

If you’re negligent for too long, mould can take over a large surface, making it almost impossible to clean at home. This is when you’ll need professional help.

Here are a few signs showing it is time to call a professional:

  • The mould has spread to an area larger than 10 square feet or 3 square meters.
  • It is present in hard to reach places such as the ventilation, heating, or cooling system.
  • All the DIY methods have failed in removing it.
  • You’re worried about the possible health concerns of the mould.

Professional cleaning services use advanced equipment and potent cleaning agents to break down even the oldest and most stubborn mould. Do not delay calling them if there is a need.

Final Words

Moisture, lack of ventilation, and negligence cause mould growth in the bathroom. You can prevent this by being more conscious about cleaning and keeping the bathroom and kitchen dry.

In an undesirable situation where the mould does find a place to live in your bathroom, you can use one of the many methods mentioned above to remove mould from the shower and grout lines.