The stainless trim on this product has very high resistance to corrosion. Despite this, blotches may appear on the surface of the stainless steel. They can be removed by a soft cloth soaked with neutral oil (WD40) or equivalent. The cause of the blotching is due to some free iron atoms from the polishing wire brushes remaining on the surface and these atoms are outside the protection afforded by the nickel and chrome alloys in the steel.
If the product is exposed to very corrosive environmental conditions (sea fronts, salty atmospheres etc) it will require additional maintenance. Before installing the stainless parts must be treated with neutral oil, which must penetrate all the joints. After treatment, dry with a soft cloth. In very corrosive environments, the treatment with oil must be repeated at least 4 times a year, in cases of serious corrosion use an abrasive paste (specifically designed for stainless steel or chrome) to remove the stain and then apply the neutral oil again.
Attention, wood preservative and solvents can damage insulation on electric cables. Allow treatment to dry prior to installing deck lights. Do not apply preservatives after installing.