Wooden spoons, cutting boards and bowls require hand-washing, because the dishwasher will eventually degrade the wood, causing cracking or warping. Wash wooden tools with warm soapy water, and then thoroughly rinse and wipe dry. Cutting boards usually require deeper cleaning, so rub them with salt to scour them before washing and drying. Wiping down bowls and cutting boards with mineral oil replaces the oil in the wood so it doesn't crack. Store cutting boards standing on their edge so they don't warp.