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Extreme Clean Patio Cleaner High Strength Sodium Hypochlorite 20.0 kg

Manufactured by Extreme Clean

Why Choose Our Products?

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Super-concentrated concrete patio cleaner – 14–15% active chlorine

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Kills moss algae lichen & mould within 10–15 minutes

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Treats up to 200 m² – dilute up to 1:6 for routine use

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Acts as an outdoor surface disinfectant for patios & pool areas

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Also used as patio bleach cleaner and for swimming pool chlorination

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Supplied in UN-approved containers with free next-day delivery (UK Mainland)

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Extreme Clean Patio Cleaner is a high-strength, professional-grade outdoor cleaning solution, formulated with 14–15% sodium hypochlorite for optimal performance. This powerful bleach-based cleaner swiftly eliminates black spot lichen, moss, algae, mildew, mold, and various stains from various outdoor surfaces. It is ideal for cleaning patios, block paving, concrete driveways, natural stone, brickwork, render, and fences.

Unlike conventional patio cleaning products, its potent composition delivers visible results within minutes, making it a preferred choice for professional contractors, landscapers, and homeowners seeking efficient outdoor cleaning solutions without extensive scrubbing. For minor contamination, a dilution ratio of up to 1:6 with water is effective, while stubborn stains may require careful, neat application for maximum strength cleaning.

Beyond its primary use as a patio and hardscape cleaner, this versatile solution also functions as a liquid chlorine treatment for swimming pool maintenance and a general outdoor hardscape sanitizer. Manufactured in the UK under ISO 9001 quality assurance, Extreme Clean Patio Cleaner is available in 5 L, 10 L, and 20 L packs, offering cost-effective coverage for outdoor cleaning projects of any scale, ensuring a spotless outdoor environment.

Ideal Uses

  • Patios & Concrete Driveways: Our products effectively clean and restore patios and concrete driveways, removing dirt, grime, moss, and other stains.

  • Block Paving & Paving Slabs: We offer solutions specifically designed for block paving and paving slabs, ensuring a thorough clean and long-lasting protection.

  • Fence Panels & Brick Walls: Our range includes products suitable for cleaning and maintaining fence panels and brick walls, helping to remove algae, mold, and general discoloration.

  • Roof Tiles, Render, and Guttering: Keep your roof tiles, render, and guttering free from dirt and organic growth with our specialized cleaning agents.

  • Pool Surrounds & Pool Water Treatment: We provide products for cleaning pool surrounds, preventing slipperiness and maintaining hygiene, as well as solutions for effective pool water treatment.

  • Outdoor Surfaces Requiring Sanitization: For any outdoor surface needing sanitization, our products offer a powerful and efficient solution, ensuring a clean and hygienic environment.

Sizes & Coverage

  • 5 L: Up to 50 m² (Routine), ≈ 25 m² (Heavy), ≈ 10 m² (Neat)

  • 10 L: Up to 100 m² (Routine), ≈ 50 m² (Heavy), ≈ 20 m² (Neat)

  • 20 L: Up to 200 m² (Routine), ≈ 100 m² (Heavy), ≈ 40 m² (Neat)

Coverage varies based on surface porosity and contamination levels.

Storage & Handling

  • Store securely in a cool, dry, ventilated place, away from heat and flames.

  • Always keep the container sealed between uses.

  • Do not mix with acids, other cleaners, or detergents.

Thinners can be diluted with water depending on the cleaning intensity.

Safety Disclaimer

Extreme Clean Patio Cleaner is a chlorine-based chemical. Use with caution:

  • Always wear protective gloves, goggles, and old clothing.

  • Avoid inhalation of vapours and prevent contact with skin or eyes.

  • If contact occurs, rinse immediately with clean water and seek medical advice if irritation persists.

  • Keep away from pets and children until surfaces are rinsed and dry.

  • Dispose of waste in line with local environmental regulations.

  • Refer to the Safety Data Sheet (SDS) for complete guidance.

Extreme Clean Patio Cleaner with High Strength is a versatile outdoor cleaning solution that delivers fast-acting results on various surfaces. It is designed for domestic and commercial use where stubborn contamination must be removed quickly and effectively.

  • Patios & Driveways: eliminates moss, black spot lichen, algae, and mildew from concrete, paving slabs, and block paving.
  • Walls & Fences: restores brick, render, and timber fencing by removing mould, mildew, and organic growth.
  • Roofs & Gutters: suitable for cleaning roof tiles and guttering, reducing moss and algae build-up.
  • Swimming Pools & Surrounds: doubles as a chlorine treatment for pools and disinfects poolside paving.
  • Outdoor Hardscapes: cleans steps, walkways, courtyards, and external stonework, improving safety and aesthetics.
  • Commercial Premises: ideal for sanitising outdoor seating areas, public courtyards, and high-traffic hardscapes.

Application Instructions

1. Safety Precautions

  • Always wear protective gloves, goggles, and old clothing.
  • Keep children and pets away until the treated surface is fully rinsed and dry.
  • Pre-wet surrounding grass, flowerbeds, or shrubs to protect from splash damage.

2. Dilution Guidelines

  • Routine Cleaning: Dilute 1:6 with water: suitable for general maintenance cleans.
  • Heavy Cleaning: Dilute 1:3 with water: for stubborn moss, algae, or lichen.
  • Deep Stain/Black Spot Removal: Apply neat for maximum strength (use with care).

3. Application Method

  • Apply using a watering can, garden sprayer, or stiff brush.
  • Ensure even coverage across the surface. Do not apply during rainfall or direct hot sun.
  • For vertical surfaces (walls/fences), start from the bottom and work upward to prevent streaking.

4. Dwell Time

  • Allow the solution to work for 10–20 minutes.
  • Do not allow the cleaner to dry on the surface. Mist lightly with water if needed.

5. Agitation & Rinsing

  • For ingrained dirt or lichen, agitate with a stiff outdoor brush.
  • Rinse thoroughly with a garden hose or pressure washer until runoff is clear.
  • For lawns or borders affected by runoff, rinse immediately with fresh water to neutralise.

6. Repeat Treatments

  • Severe black spot infestations may require a second application after 24 hours.
  • Routine cleaning once or twice per year will prevent regrowth and keep surfaces looking fresh.

7. Clean-Up

  • Rinse equipment (watering cans, sprayers, or brushes) thoroughly with clean water after use.
  • Store product in a sealed container, away from direct heat and sunlight.
Property Value
Chemical nameSodium Hypochlorite solution
Available chlorine14–15%
pH (neat)> 12
CAS number7681‑52‑9
Appearance / OdourPale yellow liquid / strong bleach smell
Shelf life6 months (store < 24 °C, out of sunlight)
Property Value
VOC0 g/L
ContainersUN-approved HDPE (5 L, 10 L, 20 L)
COVERAGE CALCULATOR
MEASURE YOUR DIMENSIONS

Frequently Asked Questions

How does Extreme Clean Patio Cleaner work on black spot lichen?
The high-strength 14–15% sodium hypochlorite formula penetrates deep into the porous surface of patios and driveways, breaking down black spot lichen cells within minutes. This chemical reaction lifts stubborn stains without excessive scrubbing, leaving a cleaner, brighter finish after rinsing.
Can this patio cleaner be used on natural stone surfaces?
Yes, it is effective on concrete, sandstone, limestone, slate, and brickwork when properly diluted. However, always test a small, inconspicuous area first to check for any colour change, as bleach-based products may slightly lighten certain delicate stones.
Is it safe for block paving and driveway use?
Absolutely. Extreme Clean Patio Cleaner removes moss, algae, and grime from block paving and concrete driveways with minimal effort. Pre-wetting nearby plants and grass and rinsing thoroughly after treatment will help prevent accidental bleaching of surrounding landscaping.
Can I use Extreme Clean Patio Cleaner on wooden fences and decking?
The solution can be used on timber fences to remove mould, algae, and mildew, but it should be applied carefully and thoroughly rinsed to avoid long-term bleaching of the wood grain. Decking should be treated with extra caution and tested on a small patch first.
Is it suitable for roof tiles and gutter cleaning?
Yes, this cleaner is widely used on roof tiles, render, and gutters to kill moss and algae. Always ensure safe roof access and avoid application during rain or strong wind to prevent splashing onto plants or windows.
Can this product be used as a swimming pool chlorine treatment?
Extreme Clean Patio Cleaner doubles as a liquid chlorine source for pool water treatment when correctly diluted. Follow pool chemical guidelines carefully to maintain safe chlorine levels and never mix with other pool chemicals directly.
How quickly does the product show visible results?
Most surfaces show a noticeable improvement within 10–20 minutes of application. Heavy black spot or deeply ingrained organic growth may require a second treatment after 24 hours to achieve a fully restored appearance.
Will it harm surrounding grass, plants, or soil?
The bleach content can burn grass or plants if left in contact. Always pre-wet surrounding areas and rinse thoroughly with clean water after use to neutralise any runoff and protect landscaping.
How often should I apply this cleaner for best results?
Routine maintenance once or twice per year keeps patios, driveways, and outdoor walls free of algae and moss. Regular cleaning helps prevent black spot from re-establishing and reduces the need for heavy scrubbing in the future.
What is the recommended dilution ratio for different cleaning needs?
For routine cleaning, dilute 1:6 with clean water. For heavy moss or algae, use a 1:3 dilution. For stubborn black spot or deep staining, neat application provides maximum strength but should be used carefully and rinsed thoroughly.
Is Extreme Clean Patio Cleaner safe to use near pets or children?
Keep pets and children away from treated areas until the surface has been thoroughly rinsed and completely dry. Once dry, the surface is safe to walk on and free from chemical residue.
What safety precautions should I take during application?
Wear protective gloves, goggles, and old clothing to protect against splashes. Avoid breathing vapours and never mix this product with acids or other cleaners, as dangerous chemical reactions may occur.

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