[請問] 黃色硬塊?
最近租房後在整理新屋,發現馬桶上有幾處黃色硬塊,用清潔劑也無法去除,請教板友們
知道這是什麼東西,該要怎麼清除呢?
http://i.imgur.com/4PHzVAG.jpg
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