Wash them in hot soapy water, and sanitize them by either boiling them in clean water or immersing them for 15 minutes in a solution of one teaspoon of chlorine bleach for every quart of clean water. If the item is porous, such as a wooden cutting board, pollutants will have soaked into the item. Verify that the sanitizing will make it safe. Generally, it is best to discard porous items.