HG Mould Spray: Mistakes to Avoid

HG mould spray is one of the most popular products people reach for when they spot mould patches in bathrooms, kitchens, or around windows. It’s quick, convenient, and effective when used correctly, but because it’s a strong chemical cleaner, it’s important to apply it safely and avoid mistakes that can lead to fumes, surface damage, or poor results.

In this guide, we’ll explain what it’s used for, how it compares to other options, how to apply it safely on walls, and what to do if mould keeps returning.

For the full cleaning process (including prevention), read our main guide on how to remove mould from walls.

Quick Answer: How to Use HG Mould Spray on Walls

To use HG mould spray safely and effectively, ventilate the room first, spray it directly onto the mould, leave it for the recommended time, then wipe the area gently and dry the wall completely to help prevent mould coming back.

What Is HG Mould Remover Used For?

HG mould remover is typically used to treat visible mould and surface mould staining on interior areas such as painted walls, ceilings, tiles, and other damp-prone surfaces.

It’s most commonly used in places where condensation and humidity build up, including bathrooms and laundry rooms.

Use our Find a Stockist tool to locate a retailer near you and pick up HG Mould Remover in store.

Is It Safe to Use Indoors

Yes, this type of mould remover can be used indoors, but it should always be used in a well-ventilated space. Like many mould removal products, the fumes can be strong and may irritate your lungs, skin, or eyes if used incorrectly.

To use it safely indoors:

• ventilate the room (open windows and doors)
• use extractor fans if available
• wear gloves
• consider eye protection
• avoid breathing in fumes directly

If anyone in your home has asthma or chemical sensitivity, it’s best to take extra care or use an alternative approach.

For more official guidance on symptoms and safety, see this advice on mould exposure and health risks.

How to Use HG Mould Spray on Walls (Safely and Effectively)

When using a mould spray on painted walls, the goal is to remove the mould without spreading spores or damaging the surface.

Step 1: Ventilate the room first

Good airflow helps reduce fumes and helps the wall dry faster afterwards.

Step 2: Protect nearby surfaces

Move items away and protect flooring if needed. Sprays can drip on vertical surfaces, especially if applied heavily.

Step 3: Apply the product carefully

Spray the cleaner directly onto the affected area. Try not to soak porous painted surfaces, particularly plaster or drywall.

Step 4: Leave it to work

Allow it to sit for the time recommended on the label. Most mould sprays work better when left to break down mould rather than scrubbed straight away.

Step 5: Wipe the area gently

Wipe with a damp cloth or sponge. If staining remains, you can repeat the process rather than scrubbing aggressively.

Step 6: Dry the wall completely

Drying is crucial. If moisture remains in the wall, mould can return quickly, even after the surface looks clean.

HG Mould Spray vs Other Mould Sprays: What’s the Difference?

This product is often chosen because it’s fast and easy, but different mould removers suit different situations. For small patches of surface mould, it’s often enough. For recurring mould issues, the better long-term solution is usually moisture control and ventilation improvements.

What If Mould Comes Back After Using HG Mould Spray?

If mould returns after cleaning, it usually means moisture is still present. The product can remove visible mould, but it can’t stop condensation, humidity, or leaks.

Common causes of recurring mould include:

• condensation on cold external walls
• poor ventilation
• humidity trapped indoors
• leaks around windows or pipework

In these cases, focus on drying and prevention to stop mould returning long-term.

Our Professional Opinion on HG Mould Spray

Our professional opinion: HG mould spray is a strong and effective option for treating visible mould on walls, but it works best when the moisture issue is addressed at the same time. If mould keeps appearing in the same corners or near windows, improving airflow and lowering humidity will usually have a bigger long-term impact than repeatedly relying on cleaning sprays alone.

Frequently Asked Questions About HG Mould Spray

Does HG mould spray kill mould or just remove stains?

HG mould spray is designed to treat mould and surface staining, but results depend on how severe the mould is and how damp the area remains afterwards.

How long should you leave HG mould spray on the wall?

Always follow the label instructions, as timings vary. Leaving it on for the recommended time helps it work properly before wiping.

Can you use HG mould spray on painted walls?

Yes, it’s commonly used on painted walls, but a spot-test is recommended first. Avoid scrubbing hard to protect the paint finish.

Why does mould come back after using HG mould spray?

Mould usually comes back due to moisture still being present, most commonly condensation, ventilation issues, or a hidden leak.

Final Thoughts: Using HG Mould Spray the Right Way

Used correctly, HG mould spray can remove mould quickly and make cleaning much easier, especially in damp-prone rooms. For the best results, focus on safe use, gentle wiping, and thorough drying afterwards.

For the full mould removal and prevention process, read our guide on how to remove mould from walls.

Need the right products to deal with mould effectively? Find your nearest Get Kitted Out Approved Stockist for expert advice and trusted solutions.