Panel edge staining is a naturally occurring problem that occurs to anodized aluminium and stainless steel panelling and façades.  It is semi-permanent staining that dulls the panel or façade's surface (in particular the edges of the panelling), reducing the natural lustre and shine produced by the anodizing processes used on the aluminium.  Panel edge staining may also appear on powder coated aluminium, painted aluminium, stainless steel and titanium surfaces.