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Historic Preservation > Technical Assistance > Rehabilitation Standard No. 7

Rehabilitation Standard No. 7

Chemical or physical treatments, such as sandblasting, that cause damage to historic materials shall not be used. The surface cleaning of structures, if appropriate, shall be undertaken using the gentlest means possible.

How To Clean Historic Materials Using the “Gentlest Means Possible”

Download pdf file "Part 1:Cleaning Historic Masonry" Part 1: Cleaning Historic Masonry
Download pdf file "Part 1:Cleaning Historic Metal" Part 2: Cleaning Historic Metal
Download pdf file "Part 1:Cleaning Historic Wood" Part 3: Cleaning Historic Wood
Download pdf file "Part 1:Cleaning Historic Stucco" Part 4: Cleaning Historic Stucco
Download pdf file "Part 1:Cleaning Historic Ceramic Tile and Terra Cotta" Part 5: Cleaning Historic Ceramic Tile and Terra Cotta
Download pdf file "Part 1:Cleaning Historic Hazardous Material" Part 6: Cleaning and Hazardous Material

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