No, pouring boiling water directly down your garbage disposal or kitchen sink drain is strongly discouraged. Extreme thermal shock from boiling water can warp or crack plastic housing parts, degrade rubber splash guards, soften PVC drain pipes, and damage internal shaft seals. Furthermore, if any residual cooking grease or fat is trapped inside your disposal or P-trap, boiling water will melt it temporarily, allowing it to travel further down your plumbing lines before solidifying into a much worse obstruction. Verification: Use warm or cold water instead of boiling water when operating and cleaning your disposal unit.
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