AlgoClear Pro - Understanding DDAC

DDAC stands for Didecyldimethylammonium Chloride, a professional-grade biocidal active ingredient used to treat and control various forms of organic growth on exterior surfaces. It is widely used within the softwashing and exterior cleaning sectors because it targets contamination at the source rather than simply removing visible staining.

Unlike pressure washing alone, which can remove surface growth without necessarily preventing it from returning, DDAC works to kill the organisms responsible for the staining and discolouration, helping to reduce regrowth over time.

DDAC is highly effective against a wide range of organic growth, including:

• Algae
• Moss
• Lichen
• Mould
• Biofilms
• Other organic contaminants commonly found on outdoor surfaces

These organisms thrive in damp, shaded environments and can quickly make hard surfaces look dirty, discoloured and slippery if left untreated.

DDAC-based treatments are suitable for a wide range of exterior hard surfaces, including:

• Patios
• Driveways
• Paths
• Roof tiles
• Render
• Cladding
• Decking
• Sports surfaces, including tennis courts
• Commercial hardstanding areas

Its versatility has made it a preferred solution for both professional contractors and homeowners looking to maintain outdoor spaces safely and effectively.

Important Note: Not Recommended for Glass
While DDAC is suitable for many exterior hard surfaces, it is not recommended for use on glass. As with any cleaning treatment, surfaces should always be checked for suitability before application, and manufacturer's guidance should be followed.

At ProGreen, DDAC is the active ingredient behind the proven performance of the AlgoClear range:

AlgoClear Pro

• AlgoClear Pro contains 40% DDAC
• Designed for professional and commercial use
• Ideal for larger areas such as roofs, driveways, commercial premises and sports facilities

AlgoClear Home & Garden

• AlgoClear Home & Garden contains 9.6% DDAC
• Designed specifically for residential applications
• Suitable for patios, paths, decking and other domestic outdoor surfaces

Both formulations deliver effective control of organic growth, with the concentration tailored to the intended application and user requirements.

One of the biggest advantages of DDAC-based treatments is their simplicity.

In most cases, the product is:

• Diluted according to the application requirements and manufacturer's instructions.
• Applied using a low-pressure sprayer or softwash system.
• Left on the surface to work naturally.

There is typically no need for aggressive scrubbing or high-pressure cleaning. Instead, the DDAC gets to work on the biological growth, breaking it down over time and treating it at the root. This makes softwashing a gentler alternative to pressure washing for many surfaces.

Results can vary depending on the type and severity of contamination.

Generally:

• Green algae often begins to show improvement relatively quickly.
• Moss may take several weeks to naturally degrade and weather away.
• Established lichen can take several months to fully disappear as the dead growth gradually breaks down through environmental exposure.

Patience is important with biocidal treatments. Unlike instant-cleaning methods, DDAC continues working after application, providing a more thorough and longer-lasting result.

One of the reasons DDAC is so highly regarded within the exterior cleaning industry is its residual effect. After application, it can continue helping to suppress regrowth, keeping surfaces cleaner for longer.

However, the length of this residual activity depends on several environmental factors, including:

• Local weather conditions
• Rainfall levels
• Temperature
• Surface porosity
• The amount of shade the area receives
• Nearby trees and vegetation
• General moisture levels

For example, a north-facing patio beneath overhanging trees may experience faster regrowth than a south-facing driveway that receives plenty of sunlight. Similarly, areas exposed to frequent rainfall may require more regular maintenance treatments than sheltered locations.

For homeowners and professionals alike, DDAC offers a practical and effective way to tackle unwanted organic growth without the risks associated with harsh pressure washing. By treating algae, moss, lichen and other biofilms at their source, it helps restore the appearance of outdoor surfaces while delivering longer-lasting results.

Whether you're maintaining a patio at home or managing large-scale commercial cleaning projects, DDAC remains one of the most trusted active ingredients for keeping exterior surfaces cleaner, safer and looking their best.

Want to see real-world results? Explore our case studies from customers like Softwash Scotland, and Artificial Grass Mainenance Cambridge in our Guides & Advice section to discover how AlgoClear Pro has helped tackle stubborn algae, moss and lichen on a wide range of surfaces. See the before and after transformations and learn why so many users consider it their go-to softwashing solution.