Best Mould Removers UK 2026: Sprays, Gels and Kits That Actually Work

Quick Comparison: Best Mould Removers UK 2026

Best Mould Removers UK 2026: Full Reviews

1. HG Mould Spray — Best Overall Mould Remover

→ View on Amazon (approx. £6 per 500ml)

HG Mould Spray is the most-recommended mould remover in the UK market, consistently topping independent product comparisons. Based on UK customer reviews and product specifications, it removes black mould from bathroom grout, silicone sealant, and tiles with minimal effort — spray on, leave for 30 minutes (or up to overnight for heavy mould), and rinse or wipe off. Most users report that no scrubbing is required.

The active ingredient is sodium hypochlorite (bleach) in a formulation designed to cling to vertical surfaces rather than running off. This contact time is what makes it significantly more effective than cheaper bleach sprays. HG positions this as a professional cleaning product rather than a consumer commodity, and the formulation reflects that.

Pros:

• Exceptionally effective — removes mould without scrubbing in most cases
• Clings to vertical surfaces for extended contact time
• Works on grout, silicone, tiles, and plastic
• 500ml bottle covers substantial area
• HG brand — trusted by professional cleaners

Cons:

• More expensive than budget supermarket sprays (~£6)
• Strong bleach smell — ventilation essential
• Not suitable for natural stone (marble, limestone)
• Contains bleach — avoid contact with fabric and coloured surfaces

Best for: Bathroom grout, silicone sealant, tiles, and shower screens with visible black or green mould. The default first recommendation for anyone dealing with bathroom mould in the UK.

2. Astonish Mould & Mildew Blaster — Best Budget Mould Spray

→ View on Amazon (approx. £2 per 750ml)

Astonish Mould and Mildew Blaster is a UK-made product that offers surprisingly strong performance at a very accessible price point. Based on UK customer reviews and product specifications, it is one of the bestselling mould treatment products in the UK, widely available in supermarkets and hardware stores. At around £2 per 750ml bottle, it is the obvious choice for budget-conscious homeowners dealing with routine bathroom mould.

The formulation is bleach-based and works well on tiles and grout when left for 10–15 minutes. It is less effective than HG on deep-set mould in silicone sealant and may require scrubbing and re-application for older, established mould colonies.

Pros:

• Exceptional value (~£2 per bottle)
• Widely available — Tesco, B&Q, Amazon, Wilko
• 750ml bottle — good for whole-bathroom treatment
• Effective on surface mould on tiles and grout
• UK manufactured

Cons:

• Less effective on established mould in sealant — may require scrubbing
• Thinner formulation than HG — less cling on vertical surfaces

Best for: Regular maintenance spraying of bathroom tiles and grout. If you use this monthly, mould is unlikely to become a serious problem. For already-established mould, use HG first then maintain with Astonish.

3. Cillit Bang Black Mould Remover — Best Gel for Grout Lines

→ View on Amazon (approx. £4)

Cillit Bang's Black Mould Remover uses a gel formulation that is specifically designed for grout lines and narrow gaps between tiles where spray products run off before they can act. From UK customer experience and manufacturer data, the gel consistency allows it to sit precisely in grout lines, delivering concentrated bleach directly to where the mould is growing.

Apply with the precision nozzle along grout lines, leave for 30–60 minutes, and rinse. The Cillit Bang formula also contains a surfactant package designed to loosen and lift mould, reducing the amount of scrubbing required. This is the right product for grout that has been discoloured and shows persistent dark lines that regular sprays haven't shifted.

Pros:

• Gel consistency — stays in grout lines rather than running off
• Precision nozzle for targeted application
• Very effective on deeply discoloured grout
• Good value at ~£4

Cons:

• Less convenient for large tile surface areas
• Slower than spray products for overall bathroom treatment

Best for: Grout lines, tile gaps, and silicone sealant edges. Particularly useful where spray products have failed to address deeply embedded discolouration.

4. Dettol Anti-Bacterial Mould & Mildew Remover — Best for Antibacterial Action

→ View on Amazon (approx. £4 per 750ml)

Dettol's Mould and Mildew Remover adds antibacterial action to standard mould treatment — useful in bathrooms used by households with young children or where hygiene is a priority beyond just visible mould removal. Drawing on real-world UK usage reports, it performs comparably to Astonish on surface mould and benefits from the Dettol brand's antibacterial credibility.

The spray works on tiles, grout, plastic, and bath sealant and includes a 'prevents regrowth' claim based on the included biocide, though the most effective prevention is always reducing humidity at source.

Pros:

• Combined antibacterial and mould-removal action
• Trusted Dettol brand
• Good price at ~£4 per 750ml
• Suitable for all common bathroom surfaces

Cons:

• Not significantly more effective than HG or Astonish for serious mould
• The antibacterial claim is less critical than addressing humidity

Best for: Bathrooms in households with young children, or where general hygiene and mould treatment combined is the priority.

5. Pro-Kleen Anti-Mould Paint Additive — Best for Prevention

→ View on Amazon (approx. £10)

Pro-Kleen Anti-Mould Paint Additive is mixed directly into emulsion paint before application. The biocide inhibits mould spore germination on painted surfaces, significantly reducing the rate at which mould regrows after a wall has been treated and repainted. According to UK homeowner reviews, it is an effective addition to any bathroom or bedroom repaint where mould has been a recurring issue.

One bottle treats typically 5–10 litres of paint. The additive is colourless and does not affect the colour or finish of the paint. It is suitable for use with most water-based emulsions. This is a preventative product — it should be used after treating and removing existing mould, not as a treatment for active mould growth.

Pros:

• Prevents mould regrowth on painted surfaces
• Colourless — doesn't affect paint appearance
• Compatible with most emulsions
• Cost-effective prevention measure

Cons:

• Not a treatment for existing mould — must treat first
• Only effective on painted surfaces
• Won't compensate for inadequate ventilation

Best for: Adding to bathroom and bedroom paint when redecorating after mould treatment. Particularly useful in older UK homes with limited ventilation.

6. Meaco Dehumidifier — Best Long-Term Solution

→ View on Amazon (approx. £170–£200)

A dehumidifier addresses the root cause of most UK household mould — excessive moisture in the air. Based on product specifications and UK buyer feedback, Meaco is consistently the most recommended dehumidifier brand in the UK, known for energy-efficient models with auto-humidity settings and continuous drainage options. Running a dehumidifier in a persistently damp room at 50–55% relative humidity is the most reliable long-term mould prevention strategy available.

This is not a cheap solution, but for households where mould returns within weeks of treatment despite regular cleaning, a dehumidifier is the correct investment. The running cost is typically £0.50–£1.00 per day depending on model and usage.

Best for: Households with persistent mould problems, older homes without adequate ventilation, ground floor flats, or rooms where condensation is visible on windows.

Spray vs Gel vs Paint Additive: Which Type Is Right?

Mould Remover Sprays

Best for: large tile areas, shower screens, plastic surfaces. Fast, convenient, good coverage. Less effective on deeply embedded mould in silicone or grout where contact time is limited by runoff.

Mould Remover Gels

Best for: grout lines, sealant edges, vertical joints. Stays in place for full contact time. Slower to apply across large areas but more effective on targeted heavy mould. The right tool when sprays have failed.

Anti-Mould Paint Additives

Best for: prevention after treating a room. Mixed into emulsion paint before application. Inhibits spore germination but does not remove existing mould — use only after the surface has been properly treated and cleaned.

Safety: Ventilation and PPE When Using Mould Remover

• Always open windows before applying bleach-based mould removers. Work with the room well-ventilated throughout the treatment period.
• Wear rubber or nitrile gloves — bleach irritates skin and can cause dermatitis with repeated exposure.
• Wear eye protection when treating overhead surfaces (shower ceiling, upper wall tiles). Bleach spray on eyes requires immediate flushing with water.
• Never mix with other cleaners — particularly ammonia-based products, which produce toxic chlorine gas when combined with bleach.
• Keep children and pets out of the treated room until the product has been rinsed and the room fully ventilated.
• Protect soft furnishings — bleach will remove colour from towels, bath mats, and clothing. Remove or cover before treating.

Preventing Mould Long-Term

• Ventilate after showering: Run the extractor fan for at least 20 minutes after every shower. If you don't have an extractor fan, leave the window open.
• Wipe down wet surfaces: A quick wipe of shower tiles and glass after each use dramatically reduces moisture available for mould growth.
• Fix leaks immediately: Any dripping tap, slow-running overflow, or weeping pipe joint creates a persistent moisture source. Don't delay repairs.
• Replace old silicone sealant annually: Bathroom sealant eventually becomes porous and harbours mould inside the material, not just on the surface. Annual replacement is cheaper than attempting to clean sealant that has mould growing through it.
• Use anti-mould emulsion paint in bathrooms and kitchens — these contain fungicide and are formulated to resist moisture.
• Monitor humidity: A cheap hygrometer (£5–10) tells you the relative humidity in each room. Above 65% is a mould risk zone; target 45–55% RH.

When Mould Is a Structural Problem: Call a Builder

Surface mould from condensation is manageable with the products above. But some mould is symptomatic of deeper structural issues that no spray will permanently resolve:

• Mould on external walls — particularly low on walls or in corners — often indicates penetrating damp (water getting in through the wall) or rising damp (water wicking up from below ground). These need professional diagnosis and remediation.
• Mould behind furniture or in rooms without direct moisture sources — suggests either cold bridging in the wall structure or inadequate insulation allowing condensation to form on the inside of cold external walls.
• Mould returning within days of treatment despite using strong products — the moisture source is overwhelming the treatment; the underlying cause must be addressed.
• Bubbling or flaking plaster — suggests water is in the wall, not just on the surface.

If you recognise any of these signs, find a rated builder in Ashford for assessment. For plastering work after damp treatment, see our plastering cost guide for Kent. Bathroom renovation following persistent damp issues is also covered in our bathroom renovation cost guide.

Frequently Asked Questions: Mould Removers

What is the mould spray spray for bathrooms in the UK?

HG Mould Spray is widely regarded as the most effective mould remover spray available in the UK, based on UK customer reviews and product specifications. It removes black mould from grout, sealant, and tiles without scrubbing and works in around 30 minutes. Astonish Mould and Mildew Blaster is a good budget alternative.

Is black mould in a bathroom dangerous?

Black mould can cause respiratory issues, allergic reactions, and worsen asthma, particularly in children and the elderly. Surface mould on grout and sealant is common in UK bathrooms and can usually be treated with appropriate products. If mould covers large areas (more than 1 square metre), is inside walls, or returns rapidly after treatment, you should consult a builder or specialist.

How do I stop mould coming back after treatment?

The key is reducing moisture. Ventilate bathrooms during and for at least 20 minutes after showering. Fix any drips or leaks immediately. Use a dehumidifier in rooms with persistent condensation. Apply anti-mould paint or paint additive after treating and cleaning. Re-seal shower and bath silicone annually with anti-mould sealant.

When should I call a builder about mould?

Call a builder if mould covers a large area (more than 1 square metre), appears on structural surfaces like walls behind plaster, returns within a few weeks of treatment, or if you notice damp patches, peeling paint, or bubbling wallpaper — these suggest water ingress from outside rather than condensation, which requires structural investigation.

As an Amazon Associate, NearbyTraders earns from qualifying purchases. Prices are approximate and subject to change.

Persistent mould? Find a rated builder in Kent for damp diagnosis and remediation.