[問題] 背蓋一點一點紋路
平常手機都有用保護殼 一直都套著
用了快一年
前面也有用玻璃保護貼
但最近殼拆下來 發現背後慘狀
一點一點坑紋
http://i.imgur.com/PMHeGDR.jpg

用酒精拼命擦也弄不掉
請問各位如何處理比較好呢
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