How to remove mould on silicone sealant with white vinegar

Mould on silicone sealant is a common problem in shower enclosures, around baths and along damp bathroom joints. This household method involves spraying white vinegar over the darkened area, as its acidity can loosen residue, lessen surface marks and tackle the smell of damp.

Why does silicone sealant build up mould so quickly?

Silicone sealant is usually found where water runs off and takes time to dry, including shower corners, bath edges and the joins between walls and floors. Steam, soap, shampoo and limited ventilation create conditions that encourage dark marks to develop on the surface.

Mould attaches more firmly when the silicone is already porous, cracked or old. In these situations, cleaning can improve its appearance, but it will not always remove the mark completely because some of the dirt may have seeped into the material.

How does white vinegar work on dark marks?

White vinegar is acidic enough to help break down soap deposits and organic dirt that feed mould. Once sprayed on and left to work, it can reach small gaps in the silicone sealant and make brushing easier after the waiting period.

• Use undiluted white vinegar in a clean spray bottle.
• Thoroughly wet the entire darkened strip of silicone.
• Leave it to work for several hours or overnight.
• Scrub using a small brush or an old toothbrush.
• Rinse with warm water and dry with a clean cloth.

What is the step-by-step method for cleaning the shower enclosure?

Before using white vinegar, remove excess water, hair and soap residue from the area. The silicone sealant should be damp only from the product rather than soaked after a recent shower, allowing the vinegar to remain in contact with the mould for longer.

• Open the window or switch on the bathroom extractor fan.
• Spray the vinegar straight onto the stained sections.
• Cover stubborn marks with kitchen towel soaked in the product.
• Wait for the product to take effect before scrubbing.
• Finish by drying the shower enclosure corners thoroughly.

When can bicarbonate of soda be used for cleaning?

If the mark remains visible, a paste made from bicarbonate of soda and a little vinegar can help during the scrubbing stage. The mixture fizzes, loosens residue stuck to the surface and provides extra abrasion for cleaning silicone sealant without using a metal scourer.

The key precaution is never to combine vinegar with bleach, chlorine or strong cleaning products. This may release irritating gases, particularly in an enclosed bathroom where steam and poor ventilation can worsen breathing discomfort.

How can mould be prevented from returning to silicone sealant?

After cleaning, the most important step is keeping the shower enclosure dry. Using a squeegee on the walls, leaving the door open and drying the joints with a cloth all reduce moisture trapped around the silicone sealant, particularly in bathrooms without a large window.

If the silicone is torn, coming away from the wall or has deep marks that do not lighten, replacing the sealant may be more effective than repeating the cleaning process. White vinegar is useful for maintenance, but deteriorated flexible sealant will continue to hold water and dirt around the edges of the shower enclosure.