A slow-draining sink or a fully blocked drain is a common household nightmare. Before you call a plumber, a cheap and powerful solution is often found in your cleaning cupboard: caustic soda (sodium hydroxide).
A: Baking soda is mild (pH ~8). Caustic soda is extremely alkaline (pH ~14). Baking soda works with vinegar for minor clogs; caustic soda dissolves grease and hair chemically. how to unblock a drain with caustic soda
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