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HG Mould Spray Review: Removes Black Mould and Prevents Re-growth

HG Mould Spray - Effective Black Mould & Mildew Cleaner, Removes Stains – 500ml
4.6
[Powerful Mould Removal]  Eliminates stubborn mould and black stains quickly and effectively.
[Prevents Regrowth]  Formula stops mould from returning for longer-lasting cleanliness.
[Multi-Surface Safe]  Works on walls, tiles, grout, seals, windows and outdoor furniture.
[Indoor & Outdoor Use]  Treats bathrooms, poolsides, sheds, saunas and conservatories.
[Bleaching Formula 500ml]  Bleaching action lifts stains; convenient 500ml spray bottle.
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Mould and mildew cleaner that targets stubborn black stains while helping to prevent re-growth. HG Mould Spray makes bathroom and outdoor cleanup quicker and less faff, restoring stained surfaces to a cleaner appearance. Suitable for regular maintenance or occasional deep cleans, is it the right solution for your home?

⚡ At a Glance
  • Cleaning Power: Bleaching effect removes visible black mould, mildew and algae stains
  • Best for: Homeowners and renters needing targeted mould removal on hard surfaces
  • Not ideal for: Delicate fabrics and untreated porous materials where bleaching could cause damage

500ml spray with a bleaching effect for indoor and outdoor use. Kills mould, mildew and algae on a wide range of hard surfaces and helps reduce re-growth.


Rapid stain removal - with bleaching action

Bleaching effect breaks down organic mould staining on contact, applied via a focused spray to concentrate active formula on affected areas.

Deep-set black marks lighten quickly after application, reducing the need for heavy scrubbing and repeated spot treatments.

Versatile surface use - with targeted spray action

Targeted spray reduces splashing and directs the active formula onto grout, seals, plaster and outdoor furniture, allowing precise application in damp spots.

One bottle covers showers, tiles, window frames and garden furniture when used as directed, making spot cleaning straightforward.

Prevents re-growth - with anti-mould action

Active agents kill live mould and algae spores on treated surfaces, lowering the immediate chance of re-infestation after treatment.

Treated areas remain cleaner for longer, meaning fewer return visits to problem patches in damp rooms or shaded outdoor areas.

✨ The 4 Key Reasons for HG Mould Spray
  1. Bleaching action - Removes deep-set black mould stains quickly and visibly.
  2. Targeted spray nozzle - Focuses application to affected areas, reducing unwanted splashing.
  3. Indoor and outdoor use - Kills algae and mould marks in many locations around home.
  4. 500ml supply - Practical bottle size for multiple spot treatments around the property.
📋 Technical Details at a Glance
  • Category: Mould & mildew cleaner
  • Brand: HG
  • Volume: 500ml
  • Application: Spray
  • Suitable surfaces: Plastered walls, tiles, bathroom seals, grout, windows, outdoor furniture
❓ Frequently Asked Questions

Q: Can HG Mould Spray be used outdoors?

A: Yes, descriptions state suitability for outdoor use and note it kills algae and mould marks around swimming pools, garages, sheds and similar areas.

Q: Will the bleaching effect damage coloured surfaces?

A: The spray has a bleaching effect, so test first in an inconspicuous place; avoid use on fabrics or untreated porous materials where discolouration is a concern.

Q: Which surfaces are suitable for treatment?

A: Listed suitable surfaces include plastered walls, tiles, bathroom seals, grout, windows and outdoor furniture, along with other hard surfaces.

🏆 Our Verdict

Ideal for homeowners and renters who need a focused solution for black mould, mildew and algae on hard surfaces. Bleaching action combined with a targeted spray makes stain removal straightforward while helping to prevent re-growth. Compact 500ml supply suits occasional deep cleans; regular users may need repeat treatments, but time saved on scrubbing suggests good long-term value.