Best Mold And Algae Remover Exterior Walls of 2025
Last updated on 22/09/2025
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Best Choice
1
Wet & Forget Mould, Lichen & Algae Remover, Outdoor Patio Cleaner, Black Spot Remover, Bleach Free, 5L
Wet & Forget
18% OffFree Shipping
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Wet & Forget
Wet & Forget Mould, Lichen & Algae Remover, Outdoor Patio Cleaner, Black Spot Remover, Bleach Free, 5L
18% OffFree Shipping
Why we love it
- Efficiently removes mould, mildew, algae.
- Large coverage for maximum cleaning.
- No harsh scrubbing required.
Main Highlights
- No Scrubbing Required: Simply mix 1 part Wet & Forget with 5 parts water, apply to the desired surface, and let it work its magic. No scrubbing, rinsing or jet washing required, just spray and walk away
- Highly Concentrated Formula: One bottle produces up to 30 litres of solution, covering a large area of 100-300m². Apply in cloudy, dry conditions for best results, ensuring at least 4-5 hours before any rainfall
- Versatile Application: Perfect for various surfaces, including patios, roofs, bricks, paving, artificial grass, tarmac, decking and more. Whether it's your driveway, headstones, or solar panels, Wet & Forget has you covered
- Softer Solution: Wet & Forget’s gentle, nearly pH-neutral formula is bleach-free making it safe to use on so many different outdoor surfaces
- Confidence in Every Spray: While our formula is gentle, we recommend wearing protective gloves and eye protection during use.
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Value for Money
2
Soluguard Multi Surface Biocide - 5L - High Strength, Ready for Use Against Fungi, Mould, and Algae on Internal and External Walls, Brick, Render, Stone, Driveway, Roof Tiles & Other Surfaces
SAFEGUARD
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SAFEGUARD
Soluguard Multi Surface Biocide - 5L - High Strength, Ready for Use Against Fungi, Mould, and Algae on Internal and External Walls, Brick, Render, Stone, Driveway, Roof Tiles & Other Surfaces
Free Shipping
Why we love it
- Clears biological growth efficiently.
- Ideal Stormdry Masonry Preparation.
- Non-flammable, low-odour formula.
Main Highlights
- Clears biological growth
- Recommended preparation for Stormdry Masonry Protection Cream
- Apply using, brush, roller, or spray
- Ready for use (no mixing)
- Low odour, non-staining, non-flammable
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3
Floorseal Green Remover Concentrate - For Roofs, Walls, Driveways & Patios – Removes Green Organic Matter, Algae, Mould & More (Formerly Moss Remover Plus) (5 Litre)
Floorseal Premium Surface Sealers & Cleaners
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Floorseal Premium Surface Sealers & Cleaners
Floorseal Green Remover Concentrate - For Roofs, Walls, Driveways & Patios – Removes Green Organic Matter, Algae, Mould & More (Formerly Moss Remover Plus) (5 Litre)
Why we love it
- Powerful, comprehensive cleaning solution.
- Requires no pressure washing.
- Safe for homes and wildlife.
Main Highlights
- POWERFUL FORMULA - For removing green organic matter on roofs, patios, driveways, walls, render, masonry & other hard surfaces. Removes severe clumps of green matter, green algae, red algae, mould and prevents the spores of black spot lichens from germinating.
- NO PRESSURE WASHING REQUIRED! – Green Remover Concentrate can easily be applied via low pressure pump-up garden spray or watering can. Apply directly to the affected surface and leave the solution to work its magic over the next days, weeks & months - no need to rinse.
- SUITABLE FOR MOST HARD SURFACES – Concrete roof tiles, clay roof tiles, marley roof tiles, natural stone roof tiles, renders, general masonry, bricks, tarmac, sandstone, slate, granite, concrete, cement tiles, block pavers, composite man-made tiles & caravans.
- MASSIVE COVERAGE - A 5 litre container will cover approximately 125m2. Apply at 1:5 diluted into clean water. For heavy contaminations of green matter this product can be applied at 1:3. Spray on and walk away.
- SAFE TO USE - A fully biodegradable product which can be applied around the exterior surfaces of homes and businesses without harm to children, pets & wildlife. Does not contain bleach or acids. Apply directly to the surface and allow it to dry, no rinsing required.
- INHIBITS REGROWTH - The application of this product has a residual affect so acts as an inhibitor preventing the return of green organic contaminants, algae, and black spot lichens. Perfect for applying annually to roofs, driveways, patios & walls cleaning & preventing the return of unwanted green growth.
- EASY TO USE - Simply spray on and walk away, no rinsing required. A great product for removing the build-up of slippery or unsightly green or red algae in the autumn, spring, and winter months. Spray over your hard surfaces to remove green organic matter, algae, mould & lichens. Apply once or twice per year to inhibit the return of unwanted green matter.
- FURTHER INFORMATION at the foot of the page.
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4
3 x 5 Litres Jarder Spray & Leave Ready to Use Patio Cleaner - Removes Green Mould and Algae. No Mixing Required - Covers 120 Square Metres.
Jarder
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Jarder
3 x 5 Litres Jarder Spray & Leave Ready to Use Patio Cleaner - Removes Green Mould and Algae. No Mixing Required - Covers 120 Square Metres.
Why we love it
- Effortless cleaning with no scrubbing.
- Covers large areas effectively.
- Safe for children and pets.
Main Highlights
- ✓ CLEANS WITH NO EFFORT: Jarder Spray And Leave Kills All Green Mould, Algae & Lichen With Ease, Without The Need For Scrubbing Or Pressure Washing! Simply Pour, Spray & Walk Away - Works Like Magic!
- ✓ SUPER STRENGTH: One 5 Litre Bottle Of Jarder Spray & Leave Ready to Use Patio Cleaner covers 40m² - Jarder Spray & Leave Is a Maximum Strength Patio Cleaner and Algae Remover Boasting 50% More Active Ingredient Than Other Brands!
- ✓ ALL HARD SURFACES: Perfect For Use On Patios, Decking, Fencing, Paths, Driveways, Roofs, Sheds, Greenhouses, Garden Statues, Terracotta Pots, UPVC Windows, Boats, Caravans, Motor Homes And All Indoor & Outdoor Hard Surfaces Affected By Green Mould and Algae.
- ✓ PREVENTS REGROWTH: Once Treated Results Will Show In 2-3 Days. Spray & Leave Penetrates Your Outdoor Surfaces Creating An Invisible Barrier Which Will Help To Prevent Re-Growth For Up To Six Months!
- ✓ SAFE & GUARANTEED RESULTS: Biodegradable PH8; Non-Caustic, No Acid & No Bleach! Jarder Spray & Leave Is Safe For Children & Pets Once The Area Is Dried.
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5
Spear & Jackson - Spray and Leave Concentrated Mould, Algae and Lichen Remover - 5 Litre
Spear & Jackson
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Spear & Jackson
Spear & Jackson - Spray and Leave Concentrated Mould, Algae and Lichen Remover - 5 Litre
Why we love it
- Extensive coverage and lasting results.
- Effectively removes green algae, mould.
- Safe to use post-drying.
Main Highlights
- One 5lt bottle makes 25lts of product Covers 100-250m2 depending on the surface
- Premium UK Manufactured Brand - Removes algae, green mould, and lichen
- Designed for use on patios, roofs, fencing, upvc windows, sheds, caravans,boats, decking and driveways
- Treated area can be used as soon as it has dried
- Helps prevent re-growth see results that last for months
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6
Patio Cleaner Concentrate 5L Makes 30L - Green Stain Removal - For Patios, Wood Decking or Fence, Driveways, Roofs & Block Paving Cleaning - Green Growth Remover
Furniture Clinic
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Furniture Clinic
Patio Cleaner Concentrate 5L Makes 30L - Green Stain Removal - For Patios, Wood Decking or Fence, Driveways, Roofs & Block Paving Cleaning - Green Growth Remover
Free Shipping
Why we love it
- Removes green staining efficiently.
- Covers large outdoor areas.
- Safe for pets and children.
Main Highlights
- REMOVES GREEN STAINING: Our Green Growth Remover will get rid of green staining from all exterior surfaces. It also prevents regrowth.
- MAKES 30 LITRES: Both 500ml and 5L bottles dilute with water to make 30 litres and will cover 125m².
- SPRAY ON AND LEAVE TO WORK: Once diluted, simply spray on, and walk away. The green stain will disappear within five days. No scrubbing or pressure washing required.
- USE ON MULTIPLE OUTDOOR SURFACES: Use our algae remover to clean and restore the appearance of all hard surfaces including decking, fences, patios, paths, tarmac, roofs, walls, stone garden pots and ornaments, uPVC windows and greenhouses.
- BIODEGRADABLE: Green Growth Remover is safe to use around children, pets and wildlife. The formula is water-based and contains no bleach or acid.
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7
5 Litre Concentrate Spray & Leave Cleaner - Patio Fencing Decking - Green Mould & Algae Killer
Jarder
5% OffFree Shipping
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Jarder
5 Litre Concentrate Spray & Leave Cleaner - Patio Fencing Decking - Green Mould & Algae Killer
5% OffFree Shipping
Why we love it
- Effortless and powerful cleaning.
- Prevents regrowth effectively.
- Super concentrated and economical.
Main Highlights
- ✓ CLEANS WITH NO EFFORT: Jarder Spray And Leave Kills All Green Mould, Algae & Lichen With Ease, Without The Need For Scrubbing Or Pressure Washing! Simply Mix, Spray & Walk Away - Works Like Magic!
- ✓ SUPER CONCENTRATE: One 5 Litre Bottle Of Jarder Spray & Leave Makes A Minimum Of 30 Litres Of Solution Covering A Huge 240m² Area - Jarder Spray & Leave Is a Maximum Strength Super Concentrate Boasting 50% More Active Ingredient Than Other Brands!
- ✓ ALL HARD SURFACES: Perfect For Use On Patios, Decking, Fencing, Paths, Driveways, Roofs, Sheds, Greenhouses, Garden Statues, Terracotta Pots, UPVC Windows, Boats, Caravans, Motor Homes And All Indoor & Outdoor Hard Surfaces Affected By Green Mould and Algae.
- ✓ PREVENTS REGROWTH: Once Treated Results Will Show In 2-3 Days. Spray & Leave Penetrates Your Outdoor Surfaces Creating An Invisible Barrier Which Will Help To Prevent Re-Growth For Up To Six Months!
- ✓ SAFE & GUARANTEED RESULTS: Biodegradable PH8; Non-Caustic, No Acid & No Bleach! Jarder Spray & Leave Is Safe For Children & Pets Once The Area Is Dried. Prepare To Be Amazed!
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8
Cillit Bang Black Mould Remover Spray I Removes Mould, Mildew & Dirt I Size: 750ml x 6
Cillit Bang
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Cillit Bang
Cillit Bang Black Mould Remover Spray I Removes Mould, Mildew & Dirt I Size: 750ml x 6
Why we love it
- Effective mould removal.
- Kills 99.9% viruses.
- Instant stain elimination.
Main Highlights
- Powerful formula destroys mould
- 100% Stain Removal
- Visable results in seconds
- Ideal for use in damp areas where mould is present
- No need to scrub
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9
Black Spot Remover Patio Cleaner - New Formula! Concentrated Outdoor Cleaner for Lichen, Algae & Stubborn Stains - Use on Paving Slabs, Stone, Concrete, Brick & Driveways - Professional Formula 5L
Liquipak
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Liquipak
Black Spot Remover Patio Cleaner - New Formula! Concentrated Outdoor Cleaner for Lichen, Algae & Stubborn Stains - Use on Paving Slabs, Stone, Concrete, Brick & Driveways - Professional Formula 5L
Why we love it
- Eradicates stubborn black spots.
- Versatile for various surfaces.
- Made in the UK.
Main Highlights
- POWERFUL BLACK SPOT REMOVER FOR PATIOS & OUTDOOR SURFACES: Formulated to remove stubborn black spots, algae, and lichen from patios, paving, stone, and brickwork. Ideal for restoring the natural look of driveways, paths, walls, and more.
- ✨ NEW FORMULA ✨ SAME GREAT RESULTS: We've updated our formula and adjusted the dilution ratio of our Black Spot Remover while ensuring it remains just as effective. Our updated formula offers a flexible dilution ratio (1:2 to 1:1), delivering the same high-performance results with better control and coverage. Check the label for revised usage instructions.
- SUITABLE FOR A WIDE RANGE OF SURFACES: Designed for patios, concrete, block paving, stone, brickwork, masonry, steps, cladding, and more. Perfect for homeowners, landscapers, and maintenance professionals.
- EASY 3-STEP APPLICATION FOR MAXIMUM RESULTS: Simply spray horizontally, vertically, and around the edges for full saturation. Leave for 45–60 minutes, keeping the surface wet, then rinse thoroughly. Repeat if needed for heavily affected areas.
- PROFESSIONAL-GRADE CLEANING, HANDLE WITH CARE Contains Sodium Hypochlorite. Wear protective gear and keep pets and people away from treated areas for 48 hours. Not suitable for use on lawns or near plants. Always patch test before full application.
- MANUFACTURED IN THE UK
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10
Zinsser Proffesional Mould, Fungi and Algae Killer and Remover 500ml
Zinsser
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Zinsser
Zinsser Proffesional Mould, Fungi and Algae Killer and Remover 500ml
Why we love it
- Instantly tackles mould issues.
- Convenient and easy to use.
- Effective, long-lasting results guaranteed.
Main Highlights
- Zinsser Professional Mushroom and Algae Mold, 500 ml
- CLEANING_AGENT
- Zinsser
- Transparent
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