After every use
Empty, rinse and dry the vessel fully. Do not leave moisture trapped under a cap or inside a nested set.
Respect the finish
Lacquered, embossed, antique and untreated surfaces may require different methods. Follow the exact care card rather than applying an abrasive or acidic home remedy universally.
Natural change is not a defect
Traditional metal surfaces can deepen, mark and patinate. The product record should distinguish expected variation from a quality issue.