To help clear slow drainage caused by organic slime and soap scum, you can pour a mixture of boiling water combined with liquid dish soap or an enzymatic drain cleaner down the shower drain. For mineral-related sluggishness, pouring warm white vinegar can help dissolve calcium crust. However, for stubborn hair blockages, pouring liquids is ineffective and requires a physical drain snake tool. Verification: Run the shower tap immediately after flushing the line to check if drainage speed has improved.
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