How to Remove Shower Mould from Silicone, Grout & Tiles: A Brisbane Guide

If you need to remove shower mould, you are dealing with one of the most common cleaning challenges in Brisbane homes. The subtropical climate, constant humidity, and daily shower steam create conditions where mould establishes itself quickly — especially in grout lines, on silicone sealant, and around tiles. The hardest case of all is mould embedded in silicone, which is exactly where most cleaning guides give up and tell you to replace it.

As professional cleaners working across Brisbane, we remove shower mould every week. Through years of testing products and refining our approach, we have found what actually works to remove shower mould, what is a waste of time, and how to keep it from returning. This guide shares exactly what we use — from mild surface mould on tiles and grout to deeply embedded black mould in silicone sealant.

Shower grout and tiles after mould removal: clean and white

BEFORE

AFTER

If you would rather have professionals handle it, our deep cleaning service includes thorough bathroom mould treatment as part of a full home reset.

Why Mould Grows in Brisbane Showers

Understanding why mould appears helps you prevent it and treat it more effectively. Mould is a type of fungi that thrives wherever there is warmth, moisture, and organic matter — and Brisbane bathrooms provide all three in abundance.

Brisbane's average humidity sits between 65% and 75% year-round, spiking higher during summer and after storms. Every hot shower adds more steam to an already humid environment. Without proper ventilation, that moisture settles on grout, silicone, tiles, and glass — creating the perfect conditions for mould spores to take hold.

The most common areas where shower mould develops are grout lines between tiles (porous and absorbs moisture), silicone sealant around the base, corners and joins (traps moisture underneath), shower glass and frames (condensation collects in corners), and the ceiling above the shower (steam rises and stays).

The good news is that most shower mould can be removed effectively with the right product and the right technique. The key to remove shower mould for good is choosing the correct approach for each surface — grout, tiles and silicone each need a slightly different method.

Black, Pink and Orange Mould: What the Colour Tells You

Not all shower mould is the same. The colour gives you a useful clue about what you are dealing with and how urgently it needs treating. Here is what the three most common shower mould colours mean.

Colour	What It Usually Is	Where You'll See It	How Urgent
Black mould	Established mould, often growing into grout or silicone	Silicone sealant, grout lines, corners	Treat promptly — hardest to remove once embedded
Pink mould	Usually a bacteria (Serratia marcescens), not a true mould	Tiles, grout, shower floor, around drains	Easy to remove if treated early
Orange mould	A mix of bacteria and mould thriving in warm, damp areas	Grout, silicone, shower floor	Treat early — spreads in humidity

Black mould in the shower is the one most people worry about, and for good reason — by the time it turns black it has usually grown into the surface, especially in silicone. Pink mould is less alarming: it is typically a bacteria that feeds on soap residue and is easy to wipe away when caught early. Orange mould sits somewhere in between. The treatment methods below work on all three colours — what changes is how many applications you will need.

Safety Before You Start

Important safety precautions: Mould removal products contain concentrated bleach or other strong chemicals. Before you begin, put on rubber gloves, wear protective glasses, and use a mask to reduce inhalation. Open a window or turn on the exhaust fan to ventilate the area. Do not use these products on marble, natural stone tiles, or delicate painted surfaces — bleach can cause permanent discolouration. Always do a patch test on an inconspicuous area first.

Method 1: Shower Mould Remover for Grout and Tiles (Best Starting Point)

For mould on tile surfaces and grout lines, a commercial shower mould remover is the most practical starting point. After testing various products available in Australia, the one we rely on most in our professional work is Exit Mould. It is widely available at Bunnings, Woolworths, and Coles.

What You Will Need:

Exit Mould spray (500ml or 1L)
Rubber gloves
Protective glasses and mask
Soft scrubbing brush or old toothbrush
Microfibre cloths
Squeegee

Step-by-Step Instructions:

Ventilate the area. Open windows and turn on the exhaust fan before you start.
Spray the shower mould remover directly onto the affected grout and tile areas. Cover the mould thoroughly — do not be conservative with the product.
Let it sit for 10 to 15 minutes. The active ingredient (concentrated sodium hypochlorite) needs time to break down the mould.
Scrub with a brush. Use a soft scrubbing brush for tiles and an old toothbrush for grout lines. The mould should lift off with moderate pressure.
Rinse thoroughly with water. Make sure all chemical residue is removed from the surfaces.
Dry completely. Use a squeegee on tiles and glass, then wipe down with microfibre cloths. Leaving the area dry is essential to prevent regrowth.

Professional tip: For grout that has light mould staining, one application is usually enough. For darker, more established mould, apply the mould remover a second time after rinsing, and let it sit for 15 to 20 minutes before scrubbing again.

Method 2: How to Remove Mould from Silicone Sealant (Without Replacing It)

This is the method most people struggle with — and where most cleaning guides fall short. The standard advice online is to simply replace mouldy silicone. But from our professional experience, you can remove mould from silicone effectively in most cases without replacing it, if you use the right product and give it enough time.

The reason a foaming shower mould remover works particularly well on silicone is its consistency. Unlike liquid sprays that run off immediately, the foam clings to the silicone surface and stays in contact with the mould long enough for the chemical to penetrate and work. This is critical — the active ingredient needs sustained contact time to reach mould that has grown into the silicone, not just on the surface.

Step-by-Step: Removing Black Mould from Silicone

What You Will Need:

Exit Mould spray (the foam is what makes this work)
Rubber gloves, protective glasses, and mask
Paper towels or cotton strips (optional, for stubborn areas)
Microfibre cloths

Instructions:

Ventilate the area and put on your protective equipment.
Apply the mould remover generously along the full length of the silicone sealant, covering all mouldy areas completely.
Let it sit for 30 minutes to 1 hour. This is the most important step. The foam needs sustained contact to penetrate the silicone and reach the mould embedded within it. Do not rinse too early.
Watch for the colour change. As the chemical absorbs into the silicone, you will see the black mould staining begin to lighten. If you can see it changing colour, the treatment is working — it is just a matter of time and repeated application.
Rinse and assess. After 1 hour, rinse the area with water and check the result. If mould staining remains, apply the product again immediately while the silicone is still damp.
Repeat as needed. For moderate mould, 2 to 3 applications in one session may be needed. Apply each time before the silicone dries out, keeping the chemical in constant contact with the mould.

Professional tip: For stubborn areas where the foam does not stay in place (such as vertical corners), soak strips of paper towel in the mould remover and press them firmly against the silicone. This keeps the chemical in contact for longer and prevents it from drying out between applications.

What About Mould Under the Silicone?

Sometimes the mould is not on the silicone but appears to be growing underneath it — visible as a dark shadow through the sealant. This means moisture has worked its way behind the silicone, and surface treatment will not fully fix it. In this case the silicone needs to be cut out, the area dried completely, and fresh sealant applied. Treating only the surface will not stop mould that is sitting behind the seal.

When Replacement Is the Only Option

If black mould has been sitting in silicone for years without treatment, the damage can become permanent — the mould grows into the material and stains it beyond what any chemical can reverse. In these cases, the silicone will need to be cut out and replaced. You can find a helpful guide on how to replace silicone sealant at Bunnings. However, if the mould has only been present for a few weeks or months, the method above will work in most cases.

Method 3: White Vinegar and Baking Soda (Natural Alternative)

If you prefer to avoid strong chemicals, or if the mould is mild and recently formed, a vinegar and baking soda combination can be effective on tiles and grout. This is a good option for regular maintenance between deeper treatments.

What You Will Need:

White vinegar (undiluted, in a spray bottle)
Baking soda
Old toothbrush or scrubbing brush
Microfibre cloths

Step-by-Step Instructions:

Spray undiluted white vinegar generously onto the mouldy grout and tile surfaces.
Let it sit for 30 minutes. Vinegar is a mild acid that helps break down mould and kill spores.
Sprinkle baking soda directly onto the vinegar-soaked areas. It will fizz — this reaction helps loosen the mould from porous grout.
Scrub with a brush using firm, focused strokes along the grout lines.
Rinse with warm water and dry thoroughly with a cloth.

Important: Vinegar and baking soda work well on tiles and grout but are not strong enough to treat mould that has penetrated into silicone sealant. For silicone, use Method 2 above.

How to Choose the Right Method

There is no single best way to remove shower mould — it depends on which surface is affected and how established the mould is. Use the table below to match the right method to your situation.

Method	Best For	Time Required	Effectiveness
1. Shower mould remover (tiles and grout)	Surface mould on tiles, grout lines, glass	15 to 30 minutes	High
2. Mould remover on silicone	Mould embedded in silicone sealant	1 to 3 hours (repeated applications)	High (unless years of untreated damage)
3. Vinegar and baking soda	Mild, recent mould on tiles and grout	30 to 45 minutes	Moderate (not effective on silicone)

Shower mould is one of the most common issues found during bond cleaning inspections in Brisbane. If you are preparing for an end-of-lease clean, treating shower mould early gives you a much better chance of passing the inspection without issues.

How to Prevent Shower Mould in Brisbane

Removing mould is only half the solution. In Brisbane's climate, it will return unless you take simple preventive steps — so once you remove shower mould, the goal is to stop it coming back. The good news is that prevention is much easier than removal.

1. Ventilate After Every Shower

Leave the exhaust fan running for at least 20 minutes after your shower finishes. If you have a window, open it. The goal is to remove the steam and lower humidity in the bathroom as quickly as possible. This single habit makes the biggest difference.

2. Squeegee Tiles and Glass After Each Use

Keep a squeegee in the shower and quickly wipe down the tiles, glass, and silicone after every use. This removes the standing water that mould needs to grow. It takes less than a minute and significantly reduces mould buildup over time.

3. Weekly Maintenance Spray

Prepare a simple solution in a spray bottle: 20% bleach and 80% water. Once a week, spray this mixture across the shower tiles, grout, and silicone after your last shower of the day. Let it sit for 5 minutes, then rinse. This low concentration is enough to kill new mould spores before they establish themselves, without the intensity of a full mould removal treatment. You can add a few drops of essential oil to reduce the bleach smell.

4. Keep an Eye on Silicone Condition

Check your silicone sealant regularly for early signs of mould — small pink or grey spots are the first stage. Treating mould when it first appears is far easier than dealing with established black mould months later. A quick application of mould remover at the first sign will stop it before it spreads.

If you maintain a regular cleaning routine, shower mould becomes a manageable issue rather than a recurring problem.

Frequently Asked Questions

How do you remove mould from silicone without replacing it?

In most cases, a foam-based shower mould remover like Exit Mould can penetrate the silicone and remove the staining with repeated applications over 1 to 3 hours. Apply it generously, let it sit for 30 to 60 minutes, watch for the staining to lighten, then reapply before the silicone dries. If the mould has only been present for a few weeks or months, this works well. If black mould has been left untreated for years, the damage may be permanent and the silicone will need to be replaced.

How do you clean silicone that has turned black?

Silicone turns black when mould has grown into the surface. The most reliable way to remove shower mould from blackened silicone is a foaming mould remover left in contact for 30 to 60 minutes, reapplied 2 to 3 times in one session before the silicone dries. You will see the black staining lighten as the chemical works. If the silicone stays black after several applications, the mould has likely caused permanent staining and the sealant needs replacing.

What is the pink mould in my shower?

Pink mould is usually not a true mould at all — it is a bacteria called Serratia marcescens that feeds on soap residue, shampoo film and minerals in water. It appears as a pink or orange film on tiles, grout and around the drain. It is easy to remove if treated early with a shower mould remover or a vinegar spray, but it returns quickly if soap scum and moisture are not kept under control.

Is shower mould dangerous to your health?

Mould releases spores into the air that can cause respiratory irritation, trigger allergies, and aggravate asthma — particularly in enclosed, humid spaces like showers. While small amounts of surface mould are common and not immediately dangerous, it should be treated promptly to prevent it from spreading and becoming a larger health concern.

Why does mould keep coming back in my shower?

Mould returns when the underlying conditions are not addressed — usually poor ventilation, standing water after showers, and high humidity. Brisbane's subtropical climate makes this worse. The most effective prevention is running the exhaust fan for 20 minutes after each shower, squeegeeing tiles and glass, and applying a diluted bleach spray weekly.

Does vinegar kill mould in the shower?

White vinegar is effective against many types of surface mould on tiles and grout. However, it is not strong enough to treat mould that has penetrated into silicone sealant — for that, a concentrated bleach-based shower mould remover is needed.

How often should I clean my shower to prevent mould?

A quick squeegee after each shower and a weekly spray with a diluted bleach solution (20% bleach, 80% water) is enough to prevent mould from establishing itself. A more thorough scrub of grout and silicone once a month helps keep everything in good condition long-term.

Final Thoughts

Shower mould in Brisbane is not a sign of a dirty home — it is a natural consequence of the local climate. What matters is how you respond to it. With the right product, the right technique, and a few simple weekly habits, you can remove shower mould and keep it from coming back without replacing silicone or resorting to expensive professional mould remediation.

The method we have outlined for silicone — using a foaming mould remover with sustained contact and repeated application — is something we have developed through our own professional cleaning work in Brisbane homes. It works in most cases where the mould has not caused permanent structural damage to the sealant.

Need Professional Help with Shower Mould?

If you would rather leave it to the professionals, our Brisbane team can handle mould removal as part of a thorough deep cleaning service. We bring the right products, the right technique, and the experience to get it done properly.

Book Your Cleaning Service