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In many cases, washing the painted surface with clean water from a garden hose will remove most of the dirt and accumulated deposits. Ideally, washing should be done annually and more frequently in coastal areas where marine salt spray is prevalent or where high levels of industrial fallout occur. In cases where spray washing is ineffective in cleaning stubborn dirt a mild detergent can be used. In all cases, test a small unobtrusive area for color-fastness before cleaning large areas. Using either solution, work from the top to the bottom of panels with a well-soaked soft cloth, sponge, brush with very soft bristles, or low-pressure spray washer to clean the surface. Washing from the top down avoids streaking. Application should be gentle. Abrasive cleaners or industrial solvents are not recommended, since they may damage the paint film. If mildew or other fungal growth is a problem and cannot be removed as described above, a detergent containing bleach is recommended. After cleaning the surface should be thoroughly rinsed with clean water to remove all traces of detergent. NOTE - Never blend cleaners and bleach yourself. If bleach and detergent are required, use a mild detergent containing bleach.
PVDF is particularly well suited to building envelope applications such as roofs,wall cladding and panels, where good colour fastness and gloss retention are important. Available in a wide range of colours. PVDF has a smooth fluorocarbon topcoat on a primer coat on a base material of Aluzinc or Hot-Dip Zinc coated steel. The standard reverse side coating is a high-performance backing coat. The performance of PVDF is defined by the Period to Re-paint Decision, which is the length of time before the building owner needs to consider whether to repaint the roof. For walls, this period can be 15 years when the coating is exposed to a normal inland environment. However, this is a guideline figure and the actual durability of PVDF in any particular location will depend upon the exact specification. The use of PVDF in a distinctly marine environment is not recommended. If used in other corrosive environments and the cut edges of the sheets are exposed, edge corrosion may occur. These edges can be painted to prevent corrosion.