Filtering is not allowed.

Cleaning and maintenance of metallic materials

Wring out a cloth in water with neutral cleaning detergent and wipe the surface. Wipe with a dampish cloth to remove any remaining cleaning detergent. Finish with wiping the surface with a dry dish cloth to remove remaining water.

Please do not use cleaning detergent with grinding effect (like scouring powder or corrosive liquids) as it will ruin the surface.