Unverified80% confidenceSolutionTime unknown
老式马桶或水垢/黄渍严重的问题不能靠凝胶块解决：凝胶是日常维护型，去除陈年尿碱需先用洁厕灵(含盐酸)强力清洁一次，再用凝胶维持
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80%
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Long-term
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