The 1987 treatment of the Thaddeus Kosciuszko Monument in Lafayette Park, Washington, DC, is described in detail including equipment, materials, and application procedures. A carefully supervised team of National Park Service employees washed the bronze statuary with nonionic detergent in 250°F water under controlled pressure, removed loose corrosion with airbrasive equipment using pulverized walnut shell, applied Benzotriazole as a corrosion inhibitor, and followed with a coating of mixed waxes. Costs are given along with estimated future maintenance costs. -- AATA