All knives must be looked after carefully. Always wash them and dry immediately after use. Do not put them in a dishwasher. When carbon-steel knives get very stained, clean them with half a lemon sprinkled with salt. If that does not work, use a scouring pad, but only occasionally. To remove rust from a carbon-steel knife, rub the blade with a burnt cork.
Sharpen your knives regularly and do not store them in a drawer, where their blades will get damaged and you may inadvertently cut your hands when reaching for them. Use a wooden knife block or knife magnet to store them instead.