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          再用湿布擦净即可。瓷砖用干软布或旧牙刷用力打圈摩擦 1~2 分钟 ,地板掉反应几分钟后擦净即可恢复光亮。有划印擦黑印立刻消失 。牙膏中的碳酸钙微粒能磨掉附着的金属粉末  ,待 24 小时固化后用细砂纸抛光即可隐形 。 针对不同黑印与划痕的快速清除妙招