Sodium hydroxide, found in drain, metal and oven cleaners, is extremely irritating to eyes, nose and throat and can burn those tissues on contact.

• 过氧化钠：多见于下水道清洁剂、金属清洁剂、炉灶清洁剂中，对眼、鼻、喉有强烈刺激作用，不慎接触则对皮肤有烧伤作用。