Experts say mould will vanish from silicone sealant with this one natural cleaner – no nasty bleach required!

Mould thrives in damp rooms, but it's possible to keep it away for good

Pink painted bathroom with a freestanding bath in the middle, and a walk-in shower area on the left and a sink on the right
(Image credit: Future PLC/Lizzie Orme)

If the silicone sealant in your kitchen and bathroom is mouldy, you’re not alone. This rubbery strip is designed to prevent water from seeping into gaps between tiles, floors and shower trays, but this is a double-edged sword. After all, it’s this exposure to moisture that makes it a breeding ground for mould.

Kitchens and bathrooms are also the dampest (and sometimes smallest) rooms in the house, and sealant is typically located in tiny corners and crevices. And when airflow is limited and there’s no respite from moisture and humidity, mouldy silicone gets worse and worse as the weeks go by. This makes it harder to remove in the long run.

But while many people are inclined to use chemicals to get rid of mould, the good news is that mouldy silicone sealant can be removed completely naturally - using one product that you probably already have in your cleaning cupboard: white vinegar.

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To remove mould from silicone sealant with white vinegar, simply spray the sealant with white vinegar and leave it for an hour (or longer if you have time).

Emma Mannion, Cleaning Expert at Astonish, says, 'Apply it generously along the affected sealant, making sure it’s fully saturated. Then leave it to sit, as this gives the vinegar time to actually penetrate and tackle the mould at its root, not just lift surface stains.'

Then, use an old toothbrush to scrub off the mould and wipe clean with a wet cloth. Finish by drying the area with a clean, dry cloth.

It’s also advisable to open the windows, wear gloves, and, ideally, a face mask when cleaning mould from silicone, as the process can disrupt mould spores and irritate your throat, nose and eyes.

White vinegar bottle with a measuring jug

(Image credit: Future PLC/Phil Barker)

As white vinegar is naturally antifungal and antibacterial, it’s far superior to bleach when cleaning mould from silicone sealant. That’s because bleach only tackles visible surface mould and doesn't penetrate deep into the silicone to address mould spores.

On the other hand, Emma says, 'White vinegar is naturally acidic, so it works by breaking down mould spores and slowing their regrowth, without the need for stronger chemical cleaners.'

It will also naturally remove mould without damaging the silicone sealant or altering the colour, so you shouldn’t need to replace it regularly.

But if the smell of white vinegar is a little too aggressive for you, I’d recommend buying the Miniml Eco White Vinegar Cleaning Sorrento Lemon Scented (5L bottle, £8.95 at Amazon). The scent is delicious and much gentler - even when sprayed vigorously.

before photo of mould in grout

(Image credit: Future PLC/ Kezia Reynolds)

However, if that doesn’t quite get the job done and the mould is particularly stubborn, Kelly Moore, Founder of Cleaning with Meaning, suggests using another natural cleaner.

She says, ‘I advise making a paste from bicarbonate of soda with water and applying it to the affected area, before gently scrubbing with an old toothbrush.’ Then, you can repeat the process with the white vinegar before ‘rinsing thoroughly and drying the area completely.’

But whatever method you choose, the key to removing mould from silicone sealant and stopping it from returning is prevention. And one of the things people with clean bathrooms always do is keep a clean, dry cloth nearby in the kitchen and bathroom.

White kitchen with grey kitchen cupboards and a white ceramic sink

(Image credit: Future PLC/Lizzie Orme)

Emma explains, 'The most effective prevention is reducing how much moisture lingers on the sealant in the first place. After using a shower or sink, quickly wiping down the edges with a dry cloth or even a piece of kitchen roll can make a big difference.'

You can also use a squeegee like this MR.SIGA Multi-Purpose Squeegee (£12.99 at Amazon) to help after you've had a shower, although Emma does still advise 'a light weekly mist of white vinegar along sealant lines' to ensure you're keeping mould at bay.

It’s also important to maintain good airflow and ventilation, so regularly opening windows, using extractor fans and even opting for a non-electric dehumidifier can work in your favour.

If you struggle to clean your sealant and can visibly see it's damaged, you can start from scratch by removing the affected silicone and replacing it with something like this Dryzone Silicone Sealant White Anti-Mould (£7.99 at Amazon). This is an easy task that you can do quickly with limited DIY knowledge.

What you need to naturally remove mould from silicone sealant and stop it from coming back

Who says you need bleach?! Natural alternatives are so much better.

Lauren Bradbury
Content Editor (House Manual)

Lauren Bradbury has been the Content Editor for the House Manual section since January 2025 but worked with the team as a freelancer for a year and a half before that. She graduated with a Bachelor’s degree in English and Creative Writing from the University of Chichester in 2016. Then, she dipped her toe into the world of content writing, primarily focusing on home content. After years of agency work, she decided to take the plunge and become a full-time freelancer for online publications, including Real Homes and Ideal Home, before taking on this permanent role. Now, she spends her days searching for the best decluttering and cleaning hacks and creating handy how-to guides for homeowners and renters alike, as well as testing vacuums as part of her role as the Ideal Home Certified Expert in Training on Vacuums, having spent over 110 hours testing different vacuum models to date!