Possible causes: This is not a material defect. It is typically caused by corrosive gases and liquids left after renovation (such as cement and paint agents) causing oxidation, or long-term exposure to acidic or alkaline substances. Hard water (rich in iron/calcium) may also contribute.

Solutions: 1) For light rust: Use a cloth dipped in toothpaste or neutral detergent to wipe along the brushed grain. 2) For stubborn rust: Clean with a scouring pad + stainless steel cleaner/talcum powder, and avoid using steel wool. 3) Daily care: Clean the sink promptly after renovation and avoid contact with highly corrosive substances.

Possible causes: Shallow basin, lack of splash guard, or failure to wipe up water in time.

Solutions: 1) Choose an integrated sintered stone basin or deep ceramic basin (depth ≥ 15 cm). 2) Wipe the vanity top dry promptly after use to avoid scale deposition. 3) Ensure the vanity top is slightly tilted during installation to facilitate drainage.