Metal furniture is handcrafted and therefore each piece has its own unique look. These are mostly hammered or hand-cast metals.
Normal maintenance requires little more than a (slightly damp) cloth to wipe the furniture with.
However, please observe the following advice: Remove stains immediately; DO NOT rub spills, but dab them with kitchen paper or an absorbent cloth. DO NOT use silicone-based furniture care products or a solvent such as stain remover, turpentine, benzene, thinner or similar. Cleaning agents with abrasives and bleach additives (e.g. lemon) are also strongly discouraged. Stains are best removed with water and possibly natural soap. Never use scouring pads.