Best Anti-Mould Sprays for UK Flats
Black mould around windows, sealant and bathroom corners is one of the most common complaints in UK flats. Anti-mould sprays remove surface mould, while anti-mould paints resist it coming back on walls and ceilings. Used alongside controlling the underlying damp, they help keep a flat cleaner and fresher. This guide rounds up effective options — with the important reminder to tackle the moisture too.
QUICK ANSWER
To treat surface mould, use a mould-remover spray on affected sealant, grout and painted surfaces, following the safety instructions and ventilating well. To help stop it returning on walls and ceilings, use an anti-mould paint. Crucially, also reduce the humidity and improve ventilation, or the mould will come back — paint and spray treat the symptom, not the cause.
Our top pick: HG Mould Remover Spray — best for fast surface mould removal
Who this guide is for
Renters and flat owners dealing with surface black mould on sealant, grout, walls or ceilings who want to clean it up and reduce how quickly it returns.
Our picks at a glance
| Pick | Product | Best for |
|---|---|---|
| BEST MOULD SPRAY | HG Mould Remover Spray Budget · See details ↓ |
Fast surface mould removal |
| BEST BUDGET SPRAY | Astonish Specialist Extra Strength Mould & Mildew Stain Blaster Budget · See details ↓ |
Affordable everyday mould cleaning |
| BEST FOR STUBBORN MOULD | Dettol Mould & Mildew Remover Spray (3 × 750ml) Mid-range · See details ↓ |
Stubborn mould across several rooms |
| BEST ANTI-MOULD PAINT | Johnstone’s Anti-Mould Bathroom Paint Premium · See details ↓ |
Resisting mould on walls & ceilings |
| BEST PAINT ALTERNATIVE | Polar Anti-Mould Paint (1L) Premium · See details ↓ |
Value anti-mould coating |
How we chose
We compared these products on the features that matter for UK flats — size, practicality, running or maintenance needs, renter-friendliness and value — using published specifications and brand reputation. We haven’t tested every product hands-on, and we don’t quote prices or star ratings here because they change; tap through to Amazon for the current figures and reviews.
The best anti-mould sprays for UK flats
HG Mould Remover Spray
Best for: Fast surface mould removal
HG is a well-known specialist cleaning brand, and its mould remover spray is a go-to for lifting black mould from sealant, grout and tiles quickly — apply, wait and rinse as directed.
Pros
- Trusted specialist brand
- Fast on surface mould
- Works on sealant, grout and tiles
- Widely recommended
Cons
- Strong chemicals — ventilate and wear gloves
- Treats symptom, not the damp cause
Astonish Specialist Extra Strength Mould & Mildew Stain Blaster
Best for: Affordable everyday mould cleaning
A budget-friendly UK-brand mould and mildew remover for regular bathroom and kitchen use, lifting surface mould and mildew stains at a lower price.
Pros
- Affordable
- Recognised UK brand
- Good for regular use
- Bathroom and kitchen safe surfaces
Cons
- Ventilate well when using
- Follow surface guidance
Dettol Mould & Mildew Remover Spray (3 × 750ml)
Best for: Stubborn mould across several rooms
A bleach-based mould and mildew remover from a brand most UK households already know, sold as a three-bottle pack. Useful if you are treating more than one room, or expect to re-treat the same spots through winter.
Pros
- Bleach-based on stubborn mould
- Recognised UK brand
- Good on sealant and grout
- Three 750ml bottles per pack
Cons
- Contains bleach — ventilate and protect skin and eyes
- Not for coloured grout or delicate surfaces
Johnstone’s Anti-Mould Bathroom Paint
Best for: Resisting mould on walls & ceilings
A brilliant-white bathroom paint from a major UK brand, formulated to resist mould and moisture on walls and ceilings — ideal for repainting a bathroom prone to mould.
Pros
- Trusted paint brand
- Resists mould and moisture
- Good for bathrooms/kitchens
- Durable, wipeable finish
Cons
- For owners or with permission to decorate
- Prepare and treat mould first
Polar Anti-Mould Paint (1L)
Best for: Value anti-mould coating
A value anti-mould paint for walls and ceilings in damp-prone rooms, adding a mould-resistant coating once you’ve treated and dried the area.
Pros
- Affordable anti-mould coating
- For walls and ceilings
- Helps resist regrowth
- Handy 1L size
Cons
- Treat and dry mould before painting
- Decorating may need landlord permission
How to choose
- Treat, then prevent: Remove surface mould with a spray, then paint mould-prone walls/ceilings with anti-mould paint — but always tackle the humidity and ventilation too.
- Ventilate and protect: Mould sprays are strong; open windows, wear gloves and avoid breathing the spray. Don’t mix cleaning chemicals.
- Prep before painting: Clean off mould and let the surface dry fully before applying anti-mould paint, or it won’t adhere or last.
- Don’t just paint over mould: Painting over active mould without treating it and fixing the damp only hides it temporarily.
- Renter note: Decorating usually needs the landlord’s permission; report persistent or spreading mould to them in writing.
Common questions
Do anti-mould sprays get rid of black mould for good?
They remove surface mould effectively, but they don’t stop it returning on their own. Mould comes back if the underlying damp and humidity aren’t addressed. Use a spray to clean it up, anti-mould paint to resist regrowth, and control moisture with ventilation and a dehumidifier for a lasting result.
Is anti-mould paint worth it?
On walls and ceilings in damp-prone rooms, yes — it resists mould and moisture better than standard paint, buying you longer between cleans. But it works best after you’ve removed existing mould, dried the area and reduced the humidity that caused it.
Are mould removal sprays safe to use in a flat?
They’re effective but contain strong chemicals, so ventilate the room well, wear gloves, keep them off skin and eyes, avoid breathing the spray, and never mix them with other cleaning products. Follow the label, and keep away from children and pets while using them.
Our recommendation
For cleaning up mould, HG Mould Remover is our top pick, with Astonish on a budget and Dettol for stubborn cases. To resist regrowth, repaint with Johnstone’s anti-mould bathroom paint or the value Polar option — and always control the damp behind the mould.
