1.1本指南概述了选择和评估清洁技术的程序，以清除砖石、混凝土和灰泥表面的污垢和污渍。去除油漆、涂料和涂鸦可能需要采取本指南范围以外的措施。新结构不在本指南范围内。 1.2本指南并不旨在解决弄脏或染色的原因，也不旨在针对反复出现的弄脏或染色提出补救措施。 1.3如果考虑在具有艺术、建筑、文化或历史意义的表面上进行工作，应寻求专家的指导。 1.4本指南并不旨在解决先前维修的拆除和更换、受损表面的维修或导致砌体、混凝土和灰泥表面不均匀或变色的其他不规则现象。 1.5本标准无意解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 砌体、混凝土和灰泥表面的清洁有多种原因，包括美观改善、去除污染物、维护和表面处理。 本指南提供了选择、测试和评估清除污垢和染色的清洁技术。 清洁系统可能会对正在清洁的建筑材料以及其他材料、机械、电气和其他建筑系统以及建筑外部、内部和场地特征产生不利影响。 在某些情况下，可能需要谨慎地进行局部清洁或不清洁。 应该注意的是，在某些情况下，清理可能与历史保护的目标不一致。

1.1 This guide outlines procedures for the selection and assessment of cleaning techniques for removing soiling and staining from masonry, concrete, and stucco surfaces. Removal of paints, coatings, and graffiti may require measures beyond the scope of this guide. New construction is excluded from the scope of this guide. 1.2 This guide does not purport to address the causes of soiling or staining or to propose remedies for recurring soiling or staining. 1.3 Where work on surfaces of artistic, architectural, cultural, or historic significance is being considered, guidance from specialists should be sought. 1.4 This guide does not purport to address removal and replacement of prior repairs, repair of damaged surfaces, or other irregularities that contribute to the uneven or discolored appearance of masonry, concrete, and stucco surfaces. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== Cleaning of masonry, concrete, and stucco surfaces is undertaken for a variety of reasons including aesthetic improvement, removal of contaminants, maintenance, and surface preparation. This guide provides for selecting, testing, and evaluating cleaning techniques for removal of soiling and staining. Cleaning systems may adversely affect both building materials being cleaned as well as other materials, mechanical, electrical, and other building systems, and building exterior, interior, and site features. In some situations, it may be prudent to spot clean or to not clean. It should be noted that, in some cases, cleaning may be inconsistent with the goals of historic preservation.