We recommend that you wash the products before using them for the first time. To guarantee the longevity of your Degrenne cutlery and knives, please follow good cleaning and maintenance practices: - Follow the recommendations of dishwasher manufacturers and cleaning products (do not overdose with product, adjust your dishwasher according to the hardness of the water),- Do not use chlorinated products (e.g. bleach),- Remove any deposits (food residues or other) as quickly as possible,- To preserve the shine of your items, do not use abrasive sponges,- To avoid corrosion spots on knives, do not mix knives and cutlery in the cutlery basket of the dishwasher,- Avoid overloading dishwasher racks. Due to their composition, knives are more sensitive to oxidation, especially when used in dishwashers. They are best washed by hand and wiped dry immediately after washing. If corrosion spots appear, they can be removed by using a cleaning product, a microfiber or a magic sponge.