This is a translation of an article which was published for the first time in a brochure entitled „Preservation Technotes”, National Park Service. U. S. Department of the Interir, Washington. D. C., Metals, number 1, August 1989, and subsequently in a report from a symposium on ,Air Pollution and Historical Monuments in Cracow”, held on 21-18June 1989 in Cracow (publ. US/ICOMOS, Washington D. C., 1991). The author discusses in great detail the conservation o f the bronze Tadeusz Kościuszko monument in Washington D. C. The removal of pollutants, bird droppings, and dirt was followed by washing the surface with a non-ionizing detergent and wallnut shell blasting. Universally applied sand blasting was considered as overly aggressive for the bronze surface which was then treated with anti-corrosion inhibitors, a protective coating of wax and buffed. Yearly control is foreseen.
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