Cleaning Tips · Mould & Mildew Removal
How to Clean Shower Mould: Grout, Silicone and Black Mould
Mix bicarb soda with hydrogen peroxide into a paste and apply it to mouldy grout or silicone. Leave it for 20–30 minutes, scrub with a stiff nylon brush, rinse thoroughly, then dry the area and improve ventilation. If mould has grown inside silicone, replacement may be the only permanent solution.
- Bicarb soda and hydrogen peroxide are effective for black mould in grout.
- Bleach removes surface mould but may not reach mould inside silicone.
- Never mix bleach with vinegar or ammonia cleaners.
- Persistent mould in silicone may require re-caulking.
- Dry bathrooms are the best defence against mould returning.
A clean shower can still develop black mould around grout lines and silicone seals. In Brisbane bathrooms, humidity, warm temperatures and trapped moisture create ideal conditions for mould growth.
Many people remove the visible black marks only to see them return a few days later. The reason is simple: surface cleaning and removing mould growth from porous materials are two different jobs.
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Why Does Shower Mould Keep Coming Back?
Shower mould keeps returning because bathrooms provide everything mould needs: moisture, warmth and organic residue. Brisbane's humid climate makes this even more noticeable, especially in bathrooms with limited airflow.
Tiles and glass are usually easier to clean because they are non-porous surfaces. Grout and silicone are different. Tiny pores allow mould spores to settle below the surface, which is why wiping alone often gives only a temporary result.
The goal is not only to remove the black marks you can see, but to reduce the conditions that allow mould to grow again.
How to Clean Black Mould From Shower Grout
Grout is one of the most common places for shower mould because it absorbs moisture. Follow these steps for a deeper clean.
-
Dry brush the grout.
Remove loose dirt, soap residue and surface mould before applying any cleaning solution. -
Create a cleaning paste.
Mix bicarbonate of soda with a small amount of hydrogen peroxide until you create a thick paste. -
Apply directly to grout lines.
Use an old toothbrush or grout brush to work the paste into affected areas. -
Allow dwell time.
Leave the solution for around 20–30 minutes so it can work below the surface. -
Scrub and rinse.
Scrub along the grout line using a stiff nylon brush, then rinse thoroughly with clean water. -
Dry the shower.
Remove excess water and run the exhaust fan to reduce remaining humidity.
Can You Remove Black Mould From Shower Silicone?
Silicone sealant is often the hardest area to restore because mould can grow inside the material rather than only sitting on the surface.
For surface mould, a paste made with bicarbonate of soda and hydrogen peroxide can help lift staining. Apply it carefully, allow enough dwell time and scrub gently with a soft brush.
However, if silicone remains black after several cleaning attempts or mould returns quickly, the growth may have penetrated the sealant. In these cases, removing the old silicone and applying fresh bathroom-grade sealant is usually the longer-lasting solution.
Mould vs Mildew: What's the Difference?
Mildew is usually a surface-level fungus that appears lighter in colour and can often be wiped away easily. Mould is more aggressive and can grow into porous materials such as grout and silicone.
If the affected area keeps returning after cleaning, looks dark green or black, or causes permanent staining, it is more likely mould rather than simple mildew.
Cleaning Mould From Tiles, Glass and Shower Curtains
Mould on tiles and glass is generally easier to remove because these surfaces do not absorb moisture in the same way grout and silicone do.
A suitable bathroom mould cleaner, vinegar solution or gentle scrub can usually remove surface growth when combined with proper drying afterwards.
For shower curtains, washing regularly and allowing them to dry completely helps prevent mould buildup.
Is Bleach or Vinegar Better for Shower Mould?
Both products have different uses. Bleach can work quickly on sealed surfaces such as tiles and glass, but it may not penetrate deeply into grout or silicone.
Vinegar-based solutions are often preferred for maintenance because they can help reduce mineral buildup and surface mould when used regularly.
| Method | Best Use | Limitation |
|---|---|---|
| Bleach | Tiles and glass | Limited penetration into grout and silicone |
| Vinegar | Maintenance cleaning | Requires time and repeated use |
| Bicarb + peroxide | Black mould spots | Requires scrubbing |
Common Mistakes That Make Shower Mould Worse
- Using bleach without addressing moisture problems.
- Mixing bleach with vinegar or ammonia products.
- Cleaning mould but leaving the bathroom damp afterwards.
- Ignoring mould returning in the same silicone areas.
- Painting or sealing over mould without removing affected material.
How to Stop Shower Mould Coming Back
- Use a shower squeegee after each shower.
- Keep the exhaust fan running for at least 20 minutes after use.
- Wash shower curtains regularly.
- Keep grout and silicone dry wherever possible.
- Fix leaks quickly to prevent hidden moisture problems.
When Cleaning Isn't Enough
Some shower mould problems are not caused by cleaning methods alone. If mould keeps returning despite proper cleaning and ventilation, the cause may be trapped moisture, poor bathroom extraction or damaged silicone.
For rental properties and end-of-lease inspections, mould around showers is one of the most noticeable issues property managers check. Professional cleaning can help restore areas where normal household cleaning is not enough.
Pretty Cleaning provides professional Bond Cleaning Brisbane services with detailed bathroom cleaning included.
Why Brisbane Households Choose Pretty Cleaning
Pretty Cleaning helps homes across Brisbane with bond cleaning, house cleaning, Airbnb cleaning and detailed bathroom cleaning. Our team focuses on removing visible dirt, buildup and problem areas while following detailed cleaning checklists.
For regular maintenance cleaning, our House Cleaning Brisbane service helps prevent bathrooms from reaching the stage where mould becomes difficult to control.
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Frequently Asked Questions
What kills black mould in shower grout?
A bicarbonate of soda and hydrogen peroxide paste can help remove black mould from grout when combined with sufficient dwell time and scrubbing.
Can black mould be removed from shower silicone?
Surface mould may be cleaned from silicone, but mould that has grown inside the sealant usually requires replacement.
Is bleach good for shower mould?
Bleach can remove surface mould from sealed surfaces, but it may not solve mould growth inside grout or silicone.
Why does mould keep returning after cleaning?
The most common reason is continued moisture. Poor ventilation and damp surfaces allow mould spores to grow again.
How often should shower mould be cleaned?
Regular maintenance every few weeks combined with good ventilation helps prevent mould from becoming established.
Does Pretty Cleaning remove bathroom mould during bond cleaning?
Yes. Bathroom mould areas are included as part of detailed bond cleaning services, depending on the condition of the property.
Ready for a Cleaner Bathroom?
If mould has become difficult to manage, Pretty Cleaning can help with professional cleaning services across Brisbane.
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Pretty Cleaning is a Brisbane cleaning company providing bond cleaning, house cleaning and commercial cleaning services. Our guides are created from practical cleaning experience and updated to help homeowners maintain cleaner properties.