Resene Construction Systems recommend washing on an annual basis to prolong the life of your house. Plaster System manufacturers typically require an annual wash as a prerequisite to keeping their warranty current. This involves applying special purpose detergents and rinsing off with a relatively low water pressure using fan spray nozzles to prevent damage to the cladding. If extensive lichen, moss and mould growth is present, a stronger treatment may be required to kill the growth and spores.
For best results use Resene Paint Prep and House Wash liquid concentrate. Apply the diluted solution with a soft broom, and wash off with copious amounts of fresh water. Most detergents have a detrimental effect on fish life so avoid letting the washings run off into the storm-water system. DO NOT use harsh solvent based cleaners.
