The external walls of commercial and industrial properties can take a battering from the wet and windy Irish weather. The result is often discolouration and corrosion caused by moisture, which remains on the surface render, which attracts organic matter such as algae and moss. Your building will then end up covered with ugly green patches which, if remain untreated, can be hard to remove. Many owners of commercial buildings and property management companies overlook the marks and stains caused by the build up of moss and algae on their premises.