How to Remove Mould from Silicone Sealant

Contents:

• Why does mould grow on sealant?
• How to identify mould on sealant
• Removal: Step-by-step
• Aftercare
• How to prevent mould growth
• FAQs

If you’ve noticed a dark substance growing in your house recently, you may be asking ‘How to remove black mould from silicone sealant?’.

Black mould can be a real household problem. Stinky, unsightly, and usually found around window and bathroom edges, it also poses health risks like skin irritants and respiratory worries. But don’t fret, because there are tried and tested methods to remove and prevent black mould growth. 

In this guide, understand why it grows, how to properly identify, prevent it, and how to remove it safely and effectively so it doesn’t come back again.

Prime conditions for mould growth are warm and wet environments that aren’t properly ventilated.

Silicone sealants are water resistant, but over time can come away from the surface and create a space for mould to thrive. Your window sills and bathroom supply the perfect setting for the black stuff to spawn. Water droplets accrue from condensation around the edges, formed from warm and cold air meeting, and lead to mouldy rims.

If surfaces aren’t regularly cleaned, moisture effectively reduced, or ventilation systems properly employed, black mould grows.

Before you learn how to remove mould from silicone, this is how to properly identify it.

How to remove black mould from silicone sealant and prevent its return are both simple processes. But first, you need to be able to properly identify it.

Black mould is bad at bluffing and gives itself away with a few signs.

The first is colour. The clue is in the name. If dark in appearance without any other type of tint, it’s usually ‘black mould’. Next is the texture, or how it feels. The fungus tends to be slimy or fuzzy and acts like a powder when dry.

Another indicator is the pattern in which it spreads, with black mould renowned for growing in circles and outward. Last is the place. Rooms or areas susceptible to high moisture and humidity, without proper ventilation, are perfect breeding grounds for the bacterium.

Scent is a classic culprit, too. Black mould aroma descriptors always fall under musty or earthy. Damp patches around your silicone sealant or the surrounding area are another tell-tale.

Here are easy ways how to remove black mould from silicone sealant, with clear step-by-step instructions below to guide you through the effective and safe removal of dark fungi.

• Soap and warm water

• Vinegar

• Bi-carbonate soda

• Bleach

• Chemical removers

These methods are ideal if you like to do it yourself with supplies like vinegar and bleach easily found around the house. Bicarbonate soda or chemical removers are readily available.
 

Preparing for the mould removal process

Before you begin, make sure your area is properly ventilated and you have suitable supplies and tools to effectively clean the infected area.

Rubber gloves or chemical resistant gloves, face masks, and goggles are essential equipment to protect from skin irritation or respiratory concerns caused by mould removal.

A scrub brush, bucket, cloths, and your chosen cleaning solution combine to remove the infestation. Plus, a vacuum cleaner helps with the initial removal of any loose mould.
 

How to remove mould from sealant with soap and water

Step 1: Mix warm water with soft soap in a bucket. A grittier product may remove the sealant.

Step 2: Dunk a cloth or sponge and wring any excess water as you don’t want to add to the moisture. Carefully wipe the affected area.

Step 3: Use your brush to gently scrub the sealant. 

Step 4: Rinse the area thoroughly after you’ve used a clean, damp cloth to wipe away any leftover soapy scud.

Step 5: Dry the area with a microfibre cloth. This helps prevent the mould from returning.

When it comes to ‘How to get rid of mould on my bathroom sealant’ soap and warm water are a classic go-to. However, they may not remove deeper-lying spores. If so, move on to the next method.

 

How to remove mould from sealant with vinegar

Step 1: Mix two parts of white vinegar with water in either a bucket or spray bottle. Apply the mixed liquid to the black mould and let it sit for at least thirty minutes.

If the fungus is excessive, you may need to leave it overnight.

Step 2: Scrub the bacteria with a cloth or brush with care until the mould falls away. Vacuum clean the mould and gently dry the sealant.

If a mix of white vinegar and water doesn’t remove your black mould, then bi-carbonate soda paste is your next port of call.
 

How to remove mould from sealant with bi-carbonate soda

Step 1: Ensure proper ventilation of the area and that you’re wearing protective equipment.

Step 2: Combine 4 tablespoons of white vinegar with 8 tablespoons of baking soda in a bucket. Apply the paste to the infestation.

Step 3: Let the solution work its magic overnight then carefully clean the mixture from the area the next morning. The black mould should come away.

Step 4: Dry the area to prevent future mould issues.

Vinegar and baking soda are usually our answer when we’re asked ‘How do I get rid of mould on my window sealant’. However, if they fall short, the next household item ideal for the job is bleach.

 

How to remove mould from sealant with bleach

Step 1: As with all methods, ventilate the area and wear rubber gloves, a face mask, and goggles.

Step 2: Blend one cup of bleach with a gallon of water, roughly a third of your typical bucket, and transfer to a spray bottle.

Step 3: Spray away and cover the area with your bleach/water concoction. Let it stand for 5 minutes.

Step 4: Scrub at the mould with your brush or cloth then rinse the area with clean water. Finally, dry the sealant thoroughly.

Bleach is usually successful. However, there are times when specific chemical removers are required.
 

How to remove mould from sealant with chemical removers

Step 1: Ventilate your area and don rubber gloves, a face mask, and goggles.

Step 2: Shop-bought chemical removers usually come in spray bottles. So, apply the solution to the black mould and let it stand as per the packet instructions.

Step 3: Use your scrub brush to rub the mould. If bits of bacteria won’t budge, reapply the chemical spray and re-scrub after the recommended wait time.

Step 4: Rinse the area with water and dry.

Chemical removers are the last resort and tend to remove mould from sealant in most cases.

The above are proven methods on how to remove black mould from silicone sealant. But as mentioned, it’s vital proper health and safety precautions are followed.

Black mould is organic matter and as such can interact with our bodies, causing skin and eye irritation, toxic exposure, and respiratory concerns.

If you don’t wear gloves or goggles, you risk itchy rashes and redness as well as issues with your eyes. Forgetting to apply your face mask could lead to coughing, wheezing, or in more serious cases, asthma attacks or allergic reactions.

Working in a properly ventilated area and wearing protective clothing reduces the potential for sickness or harm by a country mile.

Your black mould is now removed. However, to stop fungus from returning here are a few aftercare steps you should follow.

Immediately after removal, check your silicone sealants for signs of wear or tear as any cracks are potential breeding grounds for bacteria. Spot any? If so, then your sealant will need to be replaced. We house effective siliconing tools that help with the job, including mould-resistant silicone sealant.

Vigorously ventilate for the next day or two and regularly review the affected area to ensure spores haven’t returned. A dehumidifier or moisture absorber will help here.

Finally, and most simply, keep the area clean with regular rinsing and drying.

Prevention is key when managing mould growth. And proper ventilation helps stop black mould from coming back.

Ventilate the area with open windows or doors after showering and dry surfaces after use. Use and maintain your extractor fan.

Fungal patterns around your windows can be prevented by regularly cleaning them, opening them, as well as employing trickle vents. Additionally, if the problem persists, insulation might be the cure and this is how to insulate windows.

Additionally, the application of mould-preventive caulks and regular use of dehumidifiers can help.

Knowing how to remove black mould from silicone sealant is a skill worth having. And now you have it. 

Remember, when removing black mould, wear protective gear, ventilate the area, and gently rinse, scrub and dry your sealant. To prevent it from coming back, regularly clean and maintain rooms with sealant prone to bacterial growth.

If you’ve gone through each step above and spores keep appearing. It might be time for new silicone. This is how to remove silicone sealant easily.