Use a soft microfiber cloth to wipe clean the surface. Use a soft lint free cloth to wipe dry the surface. Regular cleaning with just water. Periodical cleaning with a mild soapy solution e.g. Forbo Monel dissolved in water in a ratio 1 : 20.
Prior for packing shipping an initial cleaning is advised.
Treat the depleted area with 100% pure neutral mild soap e.g. Forbo Monel. Followed by a periodical cleaning process after 1 hour.