Light metals (aluminum and aluminum alloys, zinc and the like), on the other hand, are vigorously attacked by both acids and strong alkalis, so they require cleaning products that are only mildly alkaline, while acids must not be used at all.

• 另一方面，酸和强碱都会剧烈腐蚀轻金属（铝和铝合金、锌等等），因此这类物品的清洁产品只能是弱碱性的，且绝不能用酸。