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▶ A thorough building clean-up after completion of construction should be conducted to remove all debris, metal filings, metal fines, etc. from walls and roofs.

▶ An occasional cleaning of pre finished material can extend the service life and help to maintain the appearance of the finish. For protected areas (i.e. overhangs) an annual spring cleaning is recommended. Simply washing with plain water using hoses or pressure sprays is often sufficient. Waxing is an additional method of prolonging the service life of pre finished material.

▶ In areas where heavy dirt deposits dull the surface, a solution of water and detergent may be used: 100 ml (1/3 cup) of a typical laundry powder detergent per 4 litres (1 gallon) of water. A soft bristle brush should be used for scrubbing followed by a clear water rinse.

Mildew may occur in areas subject to high humidity. To remove mildew along with the dirt, the following is suggested:

▶ Solvent and abrasive cleaners should be avoided. Caulking compounds, oils, grease, tars, wax and similar substances can be removed with mineral spirits applied only to the affected areas. Detergent cleaning and thorough rinsing should follow the use of solvent.