GK Path & Patio Cleaner 5LTR

Product Description

What Makes a Patio Cleaner Actually Work?

Walk into any garden centre and you'll find shelves of products called patio cleaners. The difference between them isn't the bottle or the label, it's whether the active chemistry kills the biological organism causing the problem, or simply bleaches it temporarily invisible.

Algae, mould, lichen, and bacteria aren't stains in the way that mud or leaf tannin is a stain. They are living organisms embedded in the surface of paving, stone, and concrete.

Bleach-based patio cleaners remove the visible pigmentation which looks like it's worked, but leave the organism's root structure alive and viable in the stone's surface. Within weeks to months, the staining returns because the organism was never killed; it was bleached. The result is a cleaning cycle that feels effective but requires repeating more and more frequently as the biological loading on the surface continues to accumulate.

GK Path & Patio Cleaner takes a fundamentally different approach. Its active DDAC biocidal chemistry kills the biological organisms responsible for surface staining at a cellular level, destroying the organism itself, not just removing its visible evidence. This is why results are more durable, why subsequent maintenance applications work faster, and why treated surfaces stay cleaner for longer than surfaces treated with bleach-based alternatives.

How GK Path & Patio Cleaner Works: The Weather Cycle Method

GK Path & Patio Cleaner is a natural surfactant biocide that works in two phases: immediate kill and progressive removal.

On application, the product foams vigorously, which is a visible, practical indicator that confirms the surface is receiving complete coverage. Any area that hasn't foamed hasn't been treated. This foaming behaviour makes systematic application straightforward even on large patio areas where it's easy to miss sections.

The biocidal chemistry begins killing biological growth on contact. The removal phase then works in conjunction with natural weather cycles. UV radiation from the sun desiccates the dead biological matter; rainfall progressively washes the residue from the surface. This is not a slow inefficiency, it is the mechanism that produces results significantly more durable than pressure washing or bleach treatment, because the dead material is removed progressively from the surface rather than being displaced to resurface again from beneath.

For mild staining, improvement is typically visible within a few days. For heavier biological loading of established lichen, thick algae, or multi-year mould accumulation, meaningful results develop over two to three months. In severe cases, the full result may take six to twelve months. Crucially, subsequent maintenance applications work considerably faster, usually within days, because baseline biological loading has been reduced by previous treatments. The maintenance cycle becomes progressively shorter and easier with each application, which is the opposite of what happens with bleach-based cleaning.

A Patio Cleaner for Every Patio Surface

GK Path & Patio Cleaner is bleach-free, acid-free, ammonia-free, and solvent-free, boasting a formula specifically designed to be safe on every outdoor surface it contacts. It is non-oxidising, which means it cannot discolour, degrade, or structurally affect any non-living hard surface. This makes it genuinely suitable for the full range of patio and path surface materials:

• Natural stone patios: Indian sandstone, limestone, slate, and flagstone. The bleach-free formula will not discolour or etch natural stone finishes.
• Porcelain paving: safe on indoor and outdoor porcelain without surface damage or finish degradation.
• Concrete and block paving: driveways, paths, and hard-standing areas affected by biological growth and surface staining.
• Decking: timber and composite. The product prevents biofilm accumulation which is the primary cause of slippery decking, and provides biocidal protection against wood-rotting organisms.
• Render and masonry: external rendered walls, brick, and stonework adjacent to the patio.
• Roof tiles, solar panels, and conservatories: safe on clay, concrete, slate, and fibreglass roof materials, UPVC, and glass.
• Caravans, polytunnels, canvas, and fibreglass: safe on all common leisure and agricultural surface materials.
• Artificial grass and Astroturf: removes biological growth and prevents slippery surface conditions on artificial surfaces.
• Painted exterior surfaces: safe on all painted hard surfaces without risk of damage to the paint film.
• Limestone, marble, and sandstone: including sensitive natural stone types that cannot be treated with acid-based cleaners.

The only surfaces excluded are green and sedum roofs.

Path and Patio Cleaner: Safety, Sustainability, and Pet Safety

GK Path & Patio Cleaner has a virtually neutral pH of 6 and contains no bleach, ammonia, acids, or solvents. Once dry, it is safe around children and animals. During application, keep children and pets away from the treated area and wear protective gloves and eye protection as a minimum requirement.

The product is plant-safe provided it is not sprayed directly onto foliage. For nearby planted borders or lawn edges, water thoroughly before application and cover with waterproof sheeting where possible. If accidental overspray occurs, rinse immediately with clean water as the product may cause temporary scorching to foliage, but will not kill established plants, and lawns recover quickly.

If access to the treated area is needed before the product has dried naturally, it can be rinsed down with fresh water after a minimum of one hour, though allowing natural drying produces the best results.

Concentrated Formula: Outstanding Coverage and Value

One 5-litre bottle of GK Path & Patio Cleaner produces up to 25 litres of ready-to-use cleaning solution:

• Heavy soiling (thick algae, established lichen, severe contamination): dilute 2:1 with water.
• Light to medium soiling (general biological growth, routine maintenance): dilute 4:1 with water.

At the 4:1 dilution rate, one bottle treats approximately 100 square metres, such as a large patio, a full driveway, or multiple path and patio areas in a single treatment session. At the heavier 2:1 rate for severe contamination, coverage reduces to approximately 50 square metres per bottle.

No specialist equipment is required. A standard garden pump sprayer handles large areas efficiently. The product can also be brush-applied for smaller or more targeted treatment areas.

Apply to a dry surface in dry conditions, with no rain forecast for at least 24 hours. Avoid application during frost or when temperatures are below 8°C. Warmer conditions accelerate visible results; slightly cooler, low-evaporation conditions allow the product more time in contact with the surface and can also produce strong results.