To prevent clogs from happening in the first place:

The most significant risk associated with this method is thermal shock.

If the water doesn't go down after two attempts, it’s time to put down the pot and pick up a plunger or call a professional.

The goal isn’t just heat; it’s pressure. Pour the hot water from about waist height directly into the drain hole. The force of the falling water helps push the softened clog through. 4. Let it Sit

Hot water works on a clog much like it works on dirty dishes. It helps break down the bonds of organic matter, softening toilet paper and fats so they can slide through the trap and down the drain. When combined with a little dish soap, it acts as a lubricant, making it one of the most effective DIY methods available. Step-by-Step: The Safe Way to Use Hot Water