DoorBird D21 Série Manuel D'installation page 25

After the cleaning rinse with clear water and dry to prevent the formation of
lime traces. Lime residues can be avoided by using demineralised water.
Stainless steel PVD coated
PVD coated, chrome-plated or gold-plated surfaces are recommended to be
cleaned with a grease-dissolving detergent and clear water or with a clean
and dust-free microfibre cloth. For high-gloss surfaces, use a scratch-free cloth
(e.g. cleaning cloth for glasses, furniture polishing cloth, etc.).
Lacquered surfaces
Clean painted surfaces and lettering with a soft, scratch-free cloth moistened
with a mild soap solution (e.g. cleaning cloth for glasses, furniture polishing
cloth, etc.). To prevent stains or discolouration, the detergents should be
wiped off without leaving any residue. Be particularly careful with lettering in
order not to damage the film or the print.
25