With care, HANA pieces can last a lifetime.
For longevity of your HANA products, handwashing with thorough drying is recommended.
More importantly we encourage everyday use so if you prefer the dishwasher then 'go for it' we say.
For persistent marks, make a paste of baking soda and water (or vinegar) and scrub gently with a soft toothbrush, sponge or cloth.