According to EXPRESS

Why Silicone Sealant Mould Is So Persistent

In the hierarchy of household cleaning frustrations, few tasks spark as much collective dread as scrubbing stubborn black mould from the silicone sealant in a shower. It’s the kind of chore that doesn’t just test your cleaning supplies—it tests your patience. For many, bathroom mould feels like an inevitability: it returns no matter how much elbow grease or chemical spray you throw at it.

But according to cleaning professionals, the solution might be sitting quietly in your kitchen cupboard—and it’s not a toxic bleach-based cleaner. Two humble, inexpensive household items—white vinegar and bicarbonate of soda—are now being championed as “fantastic” natural remedies that not only remove silicone sealant mould but make it “impossible” for it to come back.

Mould thrives where moisture lingers, and the silicone strips along the edges of showers, tubs, and sinks are a perfect target. The material’s slightly porous texture allows mould spores to cling, while its position in damp, poorly ventilated corners creates ideal growth conditions.

Bathrooms, with their daily showers and humid air, are essentially mould nurseries. Each steamy wash deposits condensation along surfaces. If that water is not wiped away, spores find a home, multiply, and—in the case of common bathroom mould like Aspergillus niger—form those tell-tale black streaks that resist standard scrubbing.

Vinegar: Nature’s Own Mould Deterrent

White vinegar has long been known in domestic science circles as a cleaning powerhouse, but here, its abilities shine particularly bright. The acetic acid in vinegar breaks down mould structures and alters the pH of the surface, making it inhospitable to further fungal growth.

According to Fantastic Services’ cleaning experts, vinegar is capable of eliminating up to 82% of mould species. Plumbing professionals at PlumbNation agree, calling it a “brilliant mould deterrent” that’s both safe and sustainable. Unlike bleach, which can damage silicone and often only removes surface staining without killing the spores, vinegar penetrates to attack mould at its roots.

How to Use Vinegar on Silicone Sealant Mould

The process is refreshingly simple:

Prepare the Vinegar Solution: Straight white vinegar is most effective, though some people dilute it slightly for easier application.
Apply Generously: Spray or dab the vinegar directly onto the mouldy silicone. Make sure the surface is completely covered.
Let It Sit: Wait about an hour. This contact time allows the acetic acid to break down the mould colonies.
Wipe Away: Use warm water and a cloth or sponge to wipe the surface clean.
Dry Thoroughly: This final step is critical—use a towel to remove all residual moisture, as dampness will invite mould to return.

When Vinegar Alone Isn’t Enough

Sometimes mould has dug in deep, staining the silicone in a way that vinegar alone can’t remove. In those cases, bicarbonate of soda (baking soda) steps in as a complementary cleaning ally.

When combined with vinegar, baking soda’s gentle abrasiveness helps physically lift mould from the surface while also creating a chemical reaction that aids in breaking it apart.

Bicarbonate Paste Method:

Mix vinegar with enough baking soda to form a thick paste.
Apply the paste to the affected area, pressing it into the mouldy silicone.
Leave it overnight for maximum effect.
Wipe away with warm water the next morning, then dry completely.

Prevention: The Real Secret to a Mould-Free Bathroom

As any homeowner knows, removing mould is only half the battle. The real win is stopping it from reappearing in the first place.

Keep Surfaces Dry: After showers, run a towel or squeegee over silicone edges to remove water.
Ventilation Matters: Use an exhaust fan or open a window during and after showers to reduce humidity.
Regular Checks: Inspect silicone monthly for early signs of mould, when it’s far easier to remove.
Vinegar Maintenance Spritz: A weekly light spray of vinegar along silicone edges can keep spores from settling.

Why Natural Cleaners Are Gaining Popularity

While bleach-based sprays have been the go-to for decades, more people are turning to natural cleaners for health and environmental reasons. Vinegar and baking soda are non-toxic, safe for pets and children, and don’t contribute to indoor air pollution. They’re also budget-friendly, with a bottle of vinegar often costing less than a single-use commercial cleaner.

There’s also the sustainability factor: harsh chemicals can wash down drains and enter water systems, potentially impacting aquatic life. Choosing a biodegradable option reduces that risk.

The Science Behind Vinegar’s Mould-Killing Power

Acetic acid works by penetrating mould’s porous structures and denaturing the proteins within the fungal cells. This not only kills the active colony but disrupts its ability to reproduce. When paired with bicarbonate of soda, the mild alkalinity of baking soda neutralizes odors and provides a physical scrubbing action that vinegar alone can’t achieve.

A Simple, Effective Bathroom Rescue

The battle against bathroom mould has been fought with endless sprays, scrubs, and, for some, complete silicone replacement. But this “fantastic” hack—combining the natural acidity of vinegar with the gentle grit of bicarbonate of soda—offers a low-cost, eco-friendly, and remarkably effective way to restore your shower’s silicone sealant to a clean, mould-free state.

More importantly, it’s a method that addresses both the immediate problem and its long-term prevention, proving that sometimes the most powerful solutions are the simplest.