Boil 2 parts water + 1 part white vinegar. Vinegar dissolves mineral scale and alkaline soap scum. Caution: Vinegar fumes are irritating – ventilate.
| After boiling water… | What to do | |----------------------|-------------| | Water level rose to rim | Stop. Do not flush. Use a wet/dry vac or auger. | | Flush pushes water up but slow drain | Repeat with dish soap + hot tap water (not boiling). | | Toilet now leaks at base | You melted the wax ring – turn off water, call a plumber. | | Toilet cracks visibly | Shut off water, do not use. Replace toilet. | boiling water clogged toilet