Remove shower mould by scrubbing the affected area with a solution of white vinegar and baking soda, then rinsing thoroughly and drying the surface completely. For stubborn black mould in grout or sealant, use a chlorine-based mould gel or a hydrogen peroxide paste, left to sit for 10–15 minutes before scrubbing. Improving bathroom ventilation afterwards is essential, or mould will return within days — especially in Dubai’s humid climate.

What Causes Mould and Mildew in Showers?

Mould and mildew grow when moisture, warmth and limited airflow combine on a surface. Mildew is a surface-level fungus that appears as a flat, powdery grey or white patch, while mould grows deeper into porous materials like grout and sealant and often appears black or dark green.

Dubai bathrooms are particularly at risk. Average outdoor humidity regularly exceeds 60%, according to the National Center of Meteorology UAE, and poorly ventilated en-suite bathrooms trap that moisture long after a shower ends. Without proper airflow, mould spores can begin forming within 24 to 48 hours of a wet surface staying damp.

Mould needs moisture, warmth and time, remove any one of these and growth slows dramatically.

How Do You Remove Black Mould From Shower Grout?

Removing black mould from grout requires a stronger cleaning agent than regular soap, because grout is porous and mould grows into the material, not just on its surface. A chlorine-based gel cleaner or a hydrogen peroxide and baking soda paste both work effectively when left to sit.

Follow these steps:

1. Ventilate the bathroom by opening a window or turning on the extractor fan.
2. Apply a chlorine-based gel cleaner (such as HG Mould Spray or a similar bleach gel) directly onto the grout lines.
3. Leave it to sit for 10–15 minutes — this gives the active ingredient time to break down mould at the root, not just the surface stain.
4. Scrub with a stiff-bristled grout brush, working along the line rather than across it.
5. Rinse thoroughly with warm water and dry the area with a clean towel or cloth.
6. Repeat if staining remains, as deeply set mould sometimes needs two treatments.

If bleach-based products aren’t preferred, a paste of three parts baking soda to one part hydrogen peroxide is a milder alternative that still breaks down mould effectively over a slightly longer contact time.

What’s the Best Way to Remove Mildew From Shower Walls?

The best way to remove mildew from shower walls is a vinegar and water solution applied directly to tiled surfaces, then wiped clean with a microfibre cloth. Because mildew sits on the surface rather than growing into the material, it responds well to milder, non-abrasive cleaning methods.

• Mix equal parts white vinegar and water in a spray bottle.
• Spray the affected wall area generously and leave for five minutes.
• Wipe down with a microfibre cloth, applying light pressure in circular motions.
• Rinse the wall with warm water and dry fully to prevent regrowth.

Vinegar’s acidity breaks down mildew’s cell structure, making it one of the most effective non-toxic options for regular maintenance cleaning.

How Do You Clean Mould From Shower Sealant?

Cleaning mould from shower sealant works best with an undiluted bleach or specialist mould-remover gel, applied directly and left to sit longer than on tiled surfaces. Sealant is more porous than tile, so mould can penetrate below the visible surface, meaning light staining often can’t be fully removed.

• Apply a mould-specific gel cleaner directly along the sealant line.
• Cover the area with cling film to stop the product drying out too quickly.
• Leave for 30–60 minutes for deeply set staining.
• Remove the cling film and scrub gently with an old toothbrush.
• Rinse and dry the area completely.

If the sealant remains discoloured after two treatment attempts, the mould has likely penetrated the material itself. At that point, replacing the sealant is more effective — and more hygienic — than continued scrubbing.

How Do You Get Rid of Mould in Shower Corners?

Shower corners collect mould faster than flat surfaces because water pools there and airflow is weakest in those spots. Cleaning corners effectively requires a smaller brush and slightly longer contact time with the cleaning solution than open wall areas.

• Use a narrow grout brush or old toothbrush to reach into the corner angle.
• Apply the chosen cleaning solution (vinegar-based for mild cases, chlorine gel for black mould) directly into the corner.
• Leave for 10–15 minutes before scrubbing in small circular motions.
• Dry the corner fully with a cloth, since trapped moisture in corners is the main cause of regrowth.

How Do You Remove Mould From Shower Caulking?

Removing mould from shower caulking follows the same principle as sealant: surface staining can often be lifted, but embedded mould usually requires replacement. A hydrogen peroxide soak is a gentler starting point before moving to stronger chlorine-based products.

1. Soak a cotton pad or strip of paper towel in hydrogen peroxide.
2. Press it directly along the caulking line and leave for 20 minutes.
3. Remove and scrub gently with a soft brush.
4. Rinse and inspect — if staining persists, repeat once with a chlorine gel product instead.

How Can You Stop Shower Mould From Coming Back?

Preventing mould from returning depends on reducing moisture and improving airflow after every shower, since mould regrows quickly once conditions are right again. Consistent small habits make a bigger difference than occasional deep cleans.

• Run the extractor fan for at least 15 minutes after each shower.
• Squeegee tiled walls and glass screens to remove standing water.
• Leave the shower door or curtain open slightly to allow the enclosure to dry out.
• Wash shower curtains or resealed areas monthly to stop early mildew forming.
• Have grout and sealant professionally deep-cleaned every three to six months in humid climates like Dubai’s.

Alo Maids has seen this pattern directly across hundreds of Dubai households: clients who combine post-shower ventilation habits with regular home cleaning plans report mould returning far less often than those relying on occasional DIY scrubbing alone. With over a decade of experience delivering bathroom cleaning services in Dubai, our Dubai cleaning team uses hospital-grade, DHA-compliant products designed specifically for the region’s humidity levels — reaching sealant, grout lines and corners that standard household cleaning often misses

The Cleaning Institute and the World Health Organization both note that persistent indoor mould exposure can contribute to respiratory irritation, particularly in humid climates — making regular removal a health matter, not just a cosmetic one.

Frequently Asked Questions

What kills mould in a shower instantly?

Nothing removes mould completely instantly, but chlorine-based gel cleaners work fastest, breaking down surface mould within 5–10 minutes of contact. For same-day results, apply the product, leave it for the recommended time, then scrub and rinse thoroughly before the area dries.

Is vinegar or bleach better for shower mould?

Vinegar is better for regular maintenance and mild mildew, while bleach-based products are more effective against deep-set black mould in grout and sealant. Vinegar is gentler and safer for frequent use; bleach should be reserved for stubborn cases and used with proper ventilation.

Why does mould keep coming back in my shower?

Mould returns when moisture and poor ventilation persist after cleaning, since spores regrow quickly in damp conditions. Improving airflow, squeegeeing surfaces after each use, and scheduling regular professional deep cleans all reduce how often mould reappears.

Can black mould in a shower make you sick?

Prolonged exposure to black mould can contribute to respiratory irritation, particularly for people with asthma or allergies, according to health bodies including the WHO. It’s not typically an emergency, but persistent black mould should be treated promptly rather than left untreated.

How often should shower grout be professionally cleaned?

In humid climates like Dubai’s, grout and sealant should be professionally deep-cleaned every three to six months. This frequency prevents mould from building up in porous materials that regular household scrubbing can’t fully reach.

Does painting over mouldy sealant work?

No, painting or covering mouldy sealant does not remove the mould — it will continue growing beneath the surface. The affected sealant needs to be cleaned or replaced entirely, since mould trapped under a new layer will eventually resurface.

What’s the difference between mould and mildew in a shower?

Mildew is a surface-level fungus, usually flat, grey or white, and relatively easy to clean. Mould grows deeper into porous materials like grout and sealant, often appears black, and typically requires stronger cleaning products or professional removal.

Should I hire a professional to remove shower mould?

Hiring a professional is worthwhile when mould keeps returning despite regular cleaning, or when it has spread into sealant and grout. Alo Maids’ Dubai teams use products and techniques that reach embedded mould household cleaning typically misses.

If mould has already spread into grout, sealant or corners, DIY treatment has limits. Book a professional deep clean with Alo Maids, or get a free cleaning quote to see what a full bathroom refresh would cost for your home.

Author

Written in consultation with the Alo Maids cleaning operations team, who have collectively cleaned thousands of Dubai homes over more than 10 years in the UAE residential cleaning industry. Alo Maids’ cleaning specialists are trained in DHA-aligned hygiene standards and use products suited to Dubai’s high-humidity climate, giving them direct, practical experience with the exact mould and mildew issues covered in this guide.