During the transformation of Corten steel, rust may be deposited on surrounding surfaces such as glass, natural stone, paving stones, aluminum, etc. This is called “bleeding” or “dripping”. These stains can be avoided if the structure is designed so that water does not run off these surfaces, but onto surfaces that are less prone to staining. Scrub these stains regularly with hot water, if necessary. This exudate is primarily stabilized iron oxide and is not harmful to the environment, vegetation or wildlife.