If you have very old PVC pipes, extremely hot water can occasionally soften joints, though this is rare with standard household "hot" water. The Bottom Line
The science behind this method relies on temperature and fluid dynamics: does hot water unclog toilet
If a child dropped a plastic toy or a toothbrush down the toilet, hot water won't dissolve it. You’ll likely need a closet auger (toilet snake). If you have very old PVC pipes, extremely
Heat helps soften organic materials and fats. or the clog seems stubborn
A clogged toilet is a universally frustrating experience. When a plunger isn't handy, or the clog seems stubborn, many homeowners turn to a simple kitchen trick: hot water. But does this method actually work, or could it cause more harm than good?