Coil and Extrusion Coatings don’t get dirty often, as they present a relatively non-adherent, inert surface to airborne soil. If needed, however, a variety of methods for removal of surface deposits are available.
Before beginning to clean coatings, note these precautions:
A 5 percent solution in water of commonly used commercial and industrial detergents will not have any deleterious effect on a coil or extrusion surface. These solutions should be followed by an adequate rinse of water. Use cloth, sponges or a soft bristle brush for application. Cleaning should be done on the shaded side of the building or, ideally, on a mild, cloudy day.
Most organic solvents are flammable and/or toxic, and must be handled accordingly. Keep away from open flames, sparks and electric motors. Use adequate ventilation, protective clothing and goggles. Remove non-water-soluble deposits (tar, grease, oil paint, graffiti, etc.) from coil and extrusion surfaces using these solvents with caution:
Hydrochloric acid (10% muriatic acid), diluted with ten volumes of water, may assist in removing rust or alkali mortar stains from coil and extrusion surfaces. Limit contact to five minutes. Caution: Acid solutions are corrosive and toxic. Flush all surfaces with water after use. Oxalic acid solutions or acetic acid (vinegar) may be used for the same purpose. Flush with water after use. Laundry bleach may assist in removing certain stains.
Remove mildew with a basic solution of the following:
Rinse with clean water immediately.