Unverified85% confidenceSolutionTime unknown
顽固水垢正确处理路径：先关水位（或用胶皮塞排空存水）→倒入酸性洁厕液使污垢完全浸没→静置15-30分钟软化→用非金属刷刷洗→充分冲水，直接刷洗未浸泡是除垢无效的主因
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