Extreme Clean Blackspot Remover for Patios & Stone Surfaces 20.0 kg

Extreme Clean Blackspot Remover is a high-strength patio black spot cleaner designed to tackle the toughest lichen, algae, and black spot growth that standard patio cleaners simply cannot remove. Containing 14–15% sodium hypochlorite, this professional-grade solution delivers over 50% more cleaning power than ordinary household bleach, allowing it to penetrate deep into porous surfaces and break down stubborn organic deposits with exceptional efficiency.

Designed for both domestic and trade use, it restores driveways, patios, and masonry to a clean, bright finish with minimal effort. This concentrated cleaner works by chemically oxidising black lichen and algae spores that settle deep within the pores of stone and concrete. 

Once applied, the active ingredients begin to react within minutes, breaking down the black lichen’s resilient outer layer and turning the spots a brownish colour as the contamination lifts away.

A simple rinse with a garden hose or pressure washer reveals the natural colour of the paving beneath, dramatically improving the appearance of weathered or neglected outdoor surfaces without the need for heavy scrubbing or aggressive jet washing.

Professional-Grade Strength

Unlike everyday patio cleaners or bleach-based products, Extreme Clean Blackspot Remover has been developed for professional-grade results, offering three different dilution ratios to suit varying levels of contamination. For routine maintenance, it can be diluted at a 1:6 ratio (1 part product to 6 parts water), which still provides a powerful clean while remaining economical for large areas.

For heavily stained or long-neglected paving, a 1:3 ratio delivers a stronger cleaning action. For the most stubborn black spots or lichen, the product can even be applied neat for maximum effectiveness. Even when diluted, it remains significantly stronger and more effective than most off-the-shelf patio cleaners, making it ideal for homeowners and contractors who require fast, lasting results.

Suitable Surfaces

Extreme Clean Blackspot Remover is versatile enough to be used on a wide range of exterior hard surfaces. It is especially effective on driveways and patio slabs, including Indian sandstone, limestone, and concrete paving, where black lichen and algae are common.

It is also suitable for block paving, brick walls, rendered masonry, roof tiles, and even pool surrounds and outdoor steps, provided a test patch is carried out to ensure colour stability and surface compatibility. Because of its high strength, it is also an excellent pre-treatment before applying patio sealers, helping to create a clean, contaminant-free surface for improved sealer adhesion and performance.

Performance and Coverage

Available in 5 L, 10 L, and 20 L pack sizes, Extreme Clean Blackspot Remover is designed to cover large areas efficiently. Coverage rates depend on surface porosity and the chosen dilution, but as a guide:

• Routine clean (1:6 dilution): up to approximately 210 m² per 5 L, 420 m² per 10 L, or 840 m² per 20 L

• Heavy stain (1:3 dilution): up to approximately 105 m² per 5 L, 210 m² per 10 L, or 420 m² per 20 L

• Neat treatment: up to approximately 30 m² per 5 L, 60 m² per 10 L, or 120 m² per 20 L

These high coverage rates make the product extremely cost-effective, particularly for large patios, driveways, or commercial projects where routine cleaning is required.

Key Benefits:

• Powerful cleaning action: Uses a professional-grade sodium hypochlorite formula to rapidly break down black lichen and algae.

• Flexible dilution: Three strength options (routine clean, heavy stain, or neat) provide full control for different levels of contamination.

• Fast results: Visible cleaning action begins within minutes, with many surfaces showing a dramatic difference after just one treatment.

• Easy application: Simply apply with a watering can or low-pressure sprayer, no specialist equipment or aggressive pressure washing required.

• Pre-sealer preparation: Ideal for preparing patios and driveways before applying a protective sealer, ensuring maximum adhesion and a clean finish.

• Cost-efficient coverage: High dilution ratios mean exceptional value per litre, even on large commercial areas.

Important Safety Guidance:

Extreme Clean Blackspot Remover is a high-strength oxidising cleaner and should be handled with care. Always wear protective gloves, goggles, and old clothing during use, and keep pets and children away from the treated area until it has been thoroughly rinsed and is completely dry.

Pre-wet surrounding grass, plants, and delicate landscaping to protect them from accidental overspray or runoff. Avoid use on polished stone, decorative metals, or painted surfaces. For stubborn black lichen or heavily contaminated areas, a second application on the following day may be required for complete removal.