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Black Staining on Render: Causes & Safe Cleaning

Black Staining on Render: Causes & Safe Cleaning

By Mark Cave September 06, 2026 |

Why Black Staining Appears on Render Black staining on render usually appears because moisture, shade and airborne contamination allow biological growth to colonise the surface. On UK properties, the most common causes are algae, cyanobacteria, mould-like organic growth, carbon soiling from pollution, dirt held in porous render and water run-off...

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