Yes — professional soft washing can remove visible mould, algae, moss and other organic build-up from suitable exterior surfaces. The specific treatment depends on the type of growth, how established it is, the surface material and condition, and the surrounding moisture and environmental exposure.
It can return. Cleaning removes existing build-up, but it doesn’t change the underlying conditions — shade, moisture, humidity, rainfall or coastal exposure — that allow mould and algae to grow in the first place. A shaded or damp property in areas like Bay of Plenty, Waikato or Wellington may need attention more often than an open, sun-exposed home in the same region. QualGroup assesses each property individually rather than applying a fixed regrowth timeline.