Mould in Tile Grout? I Tested How to Remove It for Good

Want to know the best way to remove mould from tile grout? I tested a few commercial and natural methods and I finally found a solution for you. 

how to remove mould from tile grout

The overall best way to get mould off of tile grout is with a professional mould remover spray. Any strong mould remover with sodium hypochlorite and sodium hydroxide will do. However, the quickest natural method for removing mould from tile is with hydrogen peroxide and baking soda. After testing a few different methods, these two methods delivered in terms of speed and effectiveness. 

Want to see the results of my test? Keep reading!

Safety Precautions Before Starting

When it comes to dealing with mold, safety should be your top priority. Mold, especially the common black mould like Stachybotrys Chartarum, can pose health risks and cause symptoms like coughing, sneezing, or eye irritation. It is a fungus that can severely affect the immune system.

All types of mould, whether green, black, or blue, are potentially toxic. To ensure your safety while cleaning mould, take these precautions:

  • Wear rubber gloves to protect your hands from direct contact with mould and cleaning products.
  • Use a mask to prevent inhaling mould spores, which can trigger respiratory problems.
  • Open the windows and doors. It’s important to work in a well ventilated area and minimise the concentration of mould spores in the air.

Testing How To Remove Mould Using Commercial Products

Whether you use commercial or natural products, each method has it’s advantages and disadvantages and advantages. Commercial products are generally quite fast-acting.

Method #1: Mould & Mildew Remover

For this method, I chose the HG mould spray because I used it in the past and it was highly effective in our flat when we had a mould problem. It also seemed to prevent future mould growth which is pretty important to us.

remove mould with mould spray

If you are in a country with no access to this exact product, the two main ingredients in HG Mould spray are: sodium hypochlorite (aka bleach) and sodium hydroxide (aka lye), so look for any products that contain these ingredients.

To Use

  1. Open the windows and doors and wear a glove and face mask.
  2. Spray the HG mould spray to the affected area.
  3. Let the spray sit for 10-15 minutes or longer depending on how bad it is.
  4. Scrub the grout lines with a grout brush or any old toothbrush you have on hand. This step is optional, as it this product doesn’t need scrubbing. 
  5. Rinse the grout thoroughly with warm water, scrubbing off any excess product.
  6. Dry with a microfibre cloth.

Time Spent:

It took me about 15 minutes to remove the mould from the grout using the HG mould spray.

Score: 4.5/5

I would rate the HG mould spray a 4.5 out of 5 for effectiveness. It was very effective at removing the mould, and it did not damage the grout.

I think it’s by far the best commercial grout cleaner I have ever come across. I did not give it 5 points because of the smell. It smells awful. 

{Read Post: How to Keep Bathroom Shower Floor Tiles Sparkling Clean}

Method #2: Thick/ Clinging Bleach

The second option is Thick Bleach or Clinging Bleach as it’s more popularly called the the U.S.

It is a more concentrated kind of bleach which lingers on the surface better than regular household bleach, allowing it work much better. It is important to wear gloves and a mask when using thick bleach, as it can be harmful to breathe in.

remove mould with bleach

To Use

  1. Open the windows, doors and wear a glove and face mask.
  2. Apply the bleach to the mouldy grout or shower tiles.
  3. Let the solution sit for 15-30 minutes.
  4. Scrub the grout with a brush.
  5. Rinse with warm water.
  6. Dry with a microfibre cloth.

Time Spent:

It took me about 20 minutes to remove the mould from the grout using thick bleach. Within minutes, the change in colour on the very stubborn mould stains were obvious. 

Score:

I would rate thick bleach a 4 out of 5 for effectiveness. 

Notes:

Although bleach is effective, many professionals warn against the use of bleach on grout as it can erode it over time.

Testing How To Remove Mould Using Natural Products

If you are looking for how to remove mould from shower grout naturally, I have tested a few natural cleaning agents you’ll love.

Commercial mould removers are very effective, and I love them because they are quick but they can also be harmful to your health and the environment.

If you’re looking for a more natural way to remove mould from grout, there are a few options available. I tested 3 natural methods: hydrogen peroxide and baking soda, vinegar, and oxygen bleach. I will evaluate each method for its speed and ease of use.

Method #1: Hydrogen Peroxide + Baking Soda

Hydrogen peroxide and baking soda are two natural ingredients that can be used to remove mould from grout. Hydrogen peroxide is a disinfectant that kills mould spores, and baking soda is an abrasive that helps to scrub away the mould.

Without sounding biased, I consider hydrogen peroxide and baking soda the best homemade grout cleaner that I have ever tried and the result speaks for itself.

remove mould with hydrogen peroxide

To Use

  1. Create a baking soda paste with the hydrogen peroxide. Mix until a thick paste is formed. 
  2. Apply the paste to the moldy grout, shower walls, tiles or any stained area.
  3. Let the paste sit for 30 minutes or overnight.
  4. Scrub the grout with a brush.
  5. Rinse with warm water.
  6. Wipe with a damp cloth to ensure all of the baking soda is gone.

Time Spent:

It took me about 30 minutes to remove most of the mould from the grout but it worked more efficiently than other natural methods I tried.

Score:

I would rate hydrogen peroxide and baking soda a 4 out of 5 for effectiveness. It was effective at removing the mold, although it did not completely whiten the grout. I believe it would work better with a longer application time. 

{Read Post: Permanently Remove Hard Water Stains From Glass Shower Doors}

Method #2: Vinegar & Flour

Vinegar is a natural disinfectant and it is also a mild acid that can help to dissolve mold.

remove mould with vinegar and flour

To Use

  1. Make a thick paste with some vinegar and flour. I used flour as a thickener so that the vinegar could sit on the surface longer.
  2. Spray the vinegar solution onto the mouldy grout.
  3. Let the solution sit for 30 minutes.
  4. Scrub the grout with a brush.
  5. Rinse the grout with water.
  6. Dry the excess water with a towel.

Time Spent:

It took me about 30 minutes to remove the mould from the grout using vinegar.

Score:

I would rate vinegar a 2 out of 5 for effectiveness. It wasn’t very effective at removing the mold, but you might have better results if you leave overnight.

Method #3: Oxygen Bleach

Oxygen bleach is a non-toxic alternative to chlorine bleach that some people swear by. It is made from soda ash and hydrogen peroxide. It is also a mild abrasive that can help to scrub away the mould.

remove mould with oxygen bleach

To Use

  1. Mix oxygen bleach with very hot water to activate it.
  2. Apply the paste to the grout lines with a stiff bristle brush or any old toothbrush 
  3. Let the solution sit for 30 minutes.
  4. Scrub the grout with the brush using a bit of elbow grease.
  5. Rinse the grout with warm water.
  6. Dry the grout with a rag or towel.

Time Spent:

It took me about 30 minutes to remove some mould from the grout using oxygen bleach.

Score:

I would rate oxygen bleach a 1.5 out of 5 for effectiveness. It wasn’t very effective at removing the mold, but you might have better results if you leave overnight.

How To Prevent Mould On Grout

Mould needs a few things to thrive; a damp porous area, water and humidity. Due to the very porous nature of grout, it makes a perfect home for mould spores to grow. Grout being such a porous material can easily trap moisture, which creates a breeding ground for mould.

There are a few things you can do to prevent mould from growing in your tile grout:

  • Speak to a professional. If you have a serious mould problem, that keeps returning, it is best to speak to a professional mould removal company. They will be able to remove the mould and spores permanently.
  • Regular cleaning. The best way to prevent mould is to clean your grout regularly, at least every two weeks. Be sure to rinse and dry the grout thoroughly after cleaning.
  • Use a squeegee. After each shower, it might be worth squeegeeing the water off of the tiles and grout. This will help to prevent moisture from seeping into the grout.
  • Open windows and use an exhaust fan. When you shower, open the windows and turn on the exhaust fan. This will provide adequate ventilation to the bathroom and remove moisture from the air.
  • Draw your shower curtain. When you are done showering, draw your shower curtain. This will help water dry faster and avoid having a humid environment.
  • Use a dehumidifier in the bathroom. A dehumidifier can help to remove moisture from the air, which can help to prevent mould growth.
  • Seal the grout. Grout sealants can help to prevent moisture from penetrating the grout. You can do this yearly or twice a year.
  • Replace old grout. If the grout is old and cracked, it is more likely to develop mould. If the grout is in poor condition, it is best to replace it.

Conclusion

Mould in tile grout can be a frustrating but with the products and techniques, it can be easily removed. In this article, I tested a few commercial and natural methods for removing mould from grout and the overall best way is with a commercial mould and mildew remover. I tested in particular, the HG mould spray and it was very quick and effective. It also took the least amount of time to work.

If you are looking for a natural way to remove mold from grout, hydrogen peroxide and baking soda is a good option. It was effective at removing the mold, but it did not completely whiten the grout.

No matter which method you choose, it is important to wear rubber gloves and a mask to protect yourself from the mould spores and cleaning agents. You should also open the windows and doors to ventilate the area.

I hope these tips help keep your grout mould-free for years to come.

FAQs

Is black mould in grout dangerous?

Black mould also known as Stachybotrys chartarum is dangerous and can cause severe illness, respiratory infections, wheezing and cough. If mould is found in grout, it’s important to remove it immediately taking safety precautions and speak to a professional to help eliminate mould spores if it recoccurs.

How to clean mould from grout without bleach

There are other methods besides bleach for removing mould from grout lines. Some natural methods that work are hydrogen peroxide, Vinegar and oxygen bleach whilst some commercial removers like HG mould remover or any product that contains….

How to remove mould from grout without scrubbing

The only way I have successfully removed mould from grout without scrubbing is with a strong mould remover or with bleach.
A commercial mould remover like HG mould spray or any spray that contains bleach and lye is the easiest way to clean grout without scrubbing.

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Hey you, I’m Torera

Hey there! I am Torera, a home care and cleaning enthusiast with a mission to make cleaning as fun and easy as possible for women like you. As someone who had to learn everything from scratch, I have the mindset of a beginner and know exactly how to take you from A to Z. Let us ditch the overwhelm and create a space that is clean, cozy, and totally you!