Stainless steels are "naturally" resistant to corrosion. A noble material, maintenance is essential to preserve its natural beauty. However, standard maintenance cleaning is necessary to preserve their aesthetic appeal. It's safe to say that stainless steels are virtually no different from other building materials such as glass, which also require regular maintenance.

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First, it's important to understand why stainless steel is so resistant to corrosion. Stainless steel has a thin, transparent "passive layer" on its surface. Although this protective passive layer is very thin, it has the ability to instantly regenerate under the influence of oxygen from the air or water. These recommendations are intended solely to advise building professionals on effective and cost-effective cleaning methods that will allow them to take full advantage of stainless steel's corrosion resistance. In the event of scratches or damage, the regenerated passive layer will continue to protect the surface against corrosion.

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This is why stainless steel does not require any protective coating to maintain its bright, shiny appearance, even after decades of use.

For exterior projects, such as facades, rainfall is generally sufficient to effectively clean away accumulated dust and other deposits, but this may vary depending on exposure and height. During routine cleaning, special attention should be paid to sheltered areas to remove accumulated contaminants from the air. This is particularly important in marine or industrial environments, where accumulations of chlorides or SOx in the air can cause localized corrosion if not effectively removed.

Grease and oil stains can be removed with solvents, including white spirit or other solvents such as acetone, which will not corrode stainless steel, always using a soft cloth to avoid scratching.

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Be careful not to pour the solvent directly onto the stain; it may be difficult to completely remove it. It is recommended to apply the product several times with a soft, clean cloth until all traces of dissolved oil and/or grease have disappeared.

Afterwards, using soapy water or a light detergent is usually effective and safe. Aerosol products are both easy to use and cover the surface with a light film that adds even more shine. These sprays remove fingerprints and prevent them from reappearing on surfaces. After applying the product, wipe it off with a dry cloth.

Another solution is to use a stainless steel cleaner containing phosphoric acid, then rinse with demineralized water and dry. It is recommended to treat the entire surface of the component in this way to maintain a perfectly uniform appearance.

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Cleaners that should not be used on stainless steel include:

• Chlorine-based cleaners, especially hydrochloric acid,

• Bleaching products containing bleach (if used by mistake or accidentally spilled on stainless steel surfaces, rinse thoroughly with clean water).

• Silver cleaning products.

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​​Sources Euroinox (The European Stainless Steel Development Association)