[問題] 求救 鋁框被水泥滴到
Hi 各位勇腳神腿大家好
小弟單車停在地下室被天花板滴下來的水滴到
輪框上有一些除不掉的髒東西，可能能是鈣化物？
試用了檸檬酸加水泡整個晚上，效果不佳。
想請教大家有沒有其他處理的方法，謝謝。
http://i.imgur.com/Se9Evry.jpg
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