Workers clean the window of Lotte Tower, Korea’s tallest building, in Jamsil, southern Seoul, on Tuesday. According to Lotte, it takes roughly 700 hours, or 90 days, to clean the whole building. [YONHAP]
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![Workers clean the window of Lotte Tower, Korea’s tallest building, in Jamsil, southern Seoul, on Tuesday. According to Lotte, it takes roughly 700 hours, or 90 days, to clean the whole building. [YONHAP]](https://koreajoongangdaily.joins.com/data/photo/2020/06/09/abe49073-cc67-4c0d-ac6a-986e283e33d4.jpg)
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