BRE GR27 PDF

Part 1 (6 pages) describes cleaning methods available to help you decide the methods to be used and the precautions needed. Part 2 (6 pages) gives advice on removing dirt, stains (including efflorescence) and graffiti.

Wall surfaces: concrete, calcium silicate, rendering, mortar, limestone, marble, clay bricks, terracotta, sandstone, granite, painted masonry, painted sheet cladding, metals.

Stains: bird fouling and repellent gels, organic growths (lichens, moss, etc), mortar stains, lime, efflorescence, oil, diesel, grease, bitumen, graffiti (paints and markers), metallic stains (copper, iron).