D/2 Biological Solution is a powerful, biodegradable cleaner specially formulated to remove biological growth and atmospheric staining from historic buildings, monuments, and masonry surfaces. Trusted by conservators and preservationists worldwide, D/2 has been used on iconic structures such as The White House, The Alamo, and countless heritage sites across the globe.
Developed for professional conservation use, D/2 removes mould, mildew, lichens, green algae, red algae, and airborne pollutants safely—without harsh chemicals, acids, or bleach.
Key Features
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No Acids, Salts, or Bleach – Will not etch glass, metals, or delicate surfaces
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Biodegradable & Non-Hazardous – Safe for the user and the environment
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No Special Handling or Mixing – Ready-to-use straight from the container
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Safe Around Plants – No need for extensive plant protection; rinse if overexposed
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Long Shelf Life – Stays effective for up to 5 years
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Coverage – Approx. 27 m² per gallon (based on medium-level biological deposits)
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Effective on Red Algae – One of the few products proven to remove red staining effectively
Safe for Use On
Architectural and masonry surfaces:
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Render, coloured render, concrete, brick, cast stone
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Aluminium, vinyl cladding, wood, and canvas
Natural stone including:
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Limestone, sandstone, granite, marble, slate, travertine, brownstone, and terra cotta
Application Methods
1. Immediate Result Method
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Apply undiluted D/2 using a brush, roller, or low-pressure sprayer
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Let sit for 10–15 minutes, keeping the surface wet
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Scrub with a soft nylon or natural bristle brush
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Rinse thoroughly with clean water
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Avoid metal brushes; reapply if rain falls within 12 hours
2. No Scrub / No Rinse Method
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Spray generously and allow to air dry
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Biological stains will begin to break down naturally within 1 week to 1 month
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Ideal for fragile surfaces or areas where scrubbing is not appropriate
Always perform a spot test before full application. Use above 5°C for best results.
Preservation Without Compromise
D/2 Biological Solution offers a trusted, conservation-grade cleaning system for heritage professionals, stonemasons, and contractors looking to clean masonry safely while respecting the substrate and surrounding environment.
