How do you get mould out of grout?

Mould in grout is common, especially in damp rooms such as bathrooms, toilets and kitchens. It not only looks unpleasant, but can also be difficult to remove once it has taken hold. In many cases, mould develops due to a combination of moisture, poor ventilation and surfaces remaining wet for extended periods. To remove mould effectively, it is important to use the right approach for the surface and level of contamination. Always check the manufacturer's maintenance and cleaning instructions beforehand.

HG solutions for removing mould from grout

To remove mould from grout, we recommend using a product specifically developed for this purpose. HG offers targeted solutions suitable for tile walls and grout in damp areas:

• HG mould remover foam spray is an effective mould cleaner with a unique foam formula. The foam has a less pungent odour, is easier to control and stays in place longer, allowing for more effective and longer-lasting action. Suitable for tile and rendered walls (including marble and other natural stone) and grout in bathrooms, showers, toilets and kitchens.
• HG mould spray destroys mould instantly on damp surfaces, both indoors and outdoors. It is suitable for tile walls and grout, and removes grey and black stains without the need for scrubbing.

For more information, see our guide on how to clean grout.

Solutions for removing mould from grout

Removing mould from grout requires a careful and structured approach. Mould can penetrate deep into the material and may not always be visible on the surface. It's therefore important to tackle the problem systematically and allow sufficient time for proper application and aftercare. Always consider the type of grout, the substrate and the room in which you're working.

• Ensure the area is well ventilated during and after treatment.
• Always follow the product instructions carefully.
• Test on an inconspicuous area first if you are unsure.
• Repeat the treatment if mould persists.

As we cannot guarantee the effectiveness or safety of alternative methods, we recommend using a product specifically developed for mould removal. This prevents damage to materials and reduces the chances of mould returning quickly.

Causes of mould growth in grout

Mould in grout develops due to a combination of factors that create an environment where mould can develop easily:

• Moisture – Damp surfaces allow mould to grow.
• Poor ventilation – Moisture remains for longer periods.
• Porous or worn grout – Traps moisture more easily.
• Limited natural light – Dark, damp areas encourage mould growth.

To prevent mould, reduce moisture, improve ventilation and regularly inspect grout for wear. To help prevent new mould growth, it's important to minimise moisture as much as possible, ensure good ventilation and regularly check grout for wear or damage. This keeps your bathroom or other room cleaner and fresher for longer.