The best liquid mixture to help unblock a stubborn toilet clog is a combination of hot water (warm tap water to avoid cracking porcelain) and heavy-duty liquid dish soap. The dish soap acts as a powerful lubricant, coating the inner trapway walls and helping the trapped paper and waste slide smoothly through the siphon curve. Avoid harsh chemical drain openers, as they sit in the standing bowl water and can splash dangerously. Verification: Pour the soapy water into the bowl, wait 15 minutes for it to lubricate the blockage, and use a flange plunger to clear it.
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