[問題] BETO水壼
請問各位先進，這個水壼是幾年前朋友送的。最近才想到拿出來用，但打開要清洗時看到
壼內有一層黃色的塗層(如圖)，清洗過也刷不掉。請問這是水壼本身就有的塗層嗎？還是
有變質了?感謝大家…
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