Handling anodised aluminium extrusions
As is the case with aluminium oxide, the anodised layer is also susceptible to attacks from strong acids and alkalis. In aqueous solutions, anodised surfaces are resistant to attacks within a range of pH 3–9.
Anodised aluminium extrusions/components used indoors do not normally require any form of preventive maintenance. Clean using a mild, pH neutral detergent (pH 6–8). Water is usually sufficient for this purpose.
Where anodised aluminium is used outdoors, the surface of the material must be protected from contact with wet cement and mortar during the construction period. Surfaces that are regularly exposed to rain consequently receive sufficient cleaning.
In dirty urban and industrial environments where there is extensive atmospheric fallout and the air is contaminated with sulphur dioxide and heavy metals, it is recommended that anodised surfaces are cleaned on a regular basis. Use a high-pressure water jet with a surface tension lowering additive. Highly dirty surfaces must be cleaned manually using a cloth or mild abrasive (Scotch-Brite, 3M or equivalent).
Wax or a polishing agent may be applied to provide increased protection and prevent dirt bonding to the surface.