Yes, hot water can help unclog a toilet when combined with liquid dish soap, provided the water is hot tap water rather than boiling water. Pouring boiling water directly into a cold porcelain toilet bowl can cause severe thermal shock, leading the ceramic porcelain to crack or shatter. When warm water is mixed with dish soap, it lubricates the pipe walls and softens compacted paper fibers, making it easier to plunge the obstruction. Verification: Let the soapy warm water sit for 15 minutes, then attempt to plunge or flush the bowl.
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