books.google.com - Facade staining is a centuries-old building defect that is globally widespread. Millions of dollars are wasted annually for its rectification. A stained building looks old and worn-out, diminishing the value of the property and the confidence in occupying it. The facade's durability may also be affected...http://books.google.com/books/about/Staining_of_Facades.html?id=Ac6NIjrZjb8C&utm_source=gb-gplus-shareStaining of Facades
