The exterior walls of buildings are prone excess moss, algae, black spots and lichen. Over time render can also discolour if not regularly maintained. Using abrasive cleaning methods such as power washing on K-rend and coloured renders will actually damage cause lasting damage. For example, water at high pressure can penetrate into cracks, freeze in colder weather, expand and cause your render to blow. Extremely tough on dirt yet gentle on render and stone, softwashing is not just limited to render cleans. We use this cleaning method for patios, driveways, stonework, bath stone and much more.