All living things excrete harmful and unwanted wastes from their body (Excretion)

Many chemical process are going on in living body.  Along with energy and useful substances, many wastes, harmful and surplus substances such as urine, faces and carbon dioxide are also produced as a result of these                         processes.  These substances must be removed, as they are extremely harmful if they remain in the body.  The removal of wastes and surplus materials from the body is called excretion. Plants also excrete certain wastes and gases. 

Have you ever seen any excessive and harmful wastes being excreted by non-living things.  All living things excrete harmful and unwanted wastes from their body, but non-living things do not.