Make sure that the only thing you are placing in the water is the silicone material. Do not put your phone in the boiling water! If there are hard plastic components to your case, make sure to remove those from the silicon before continuing. [1] X Research source
Ensure the case doesn’t touch the bottom or sides of the cooking vessel to avoid melting the case.
Your cold water bath doesn’t need to be ice cold, but it should be sufficiently cold enough to cool the hot phone case. The colder the water bath, the less time it will take to move on to the next step.
If you don’t have a dish towel, a large towel will work. Again, ensure the towel is clean, as the dried case is going back on your phone. Avoid using paper towels. Bits of paper might get caught in the case. Similarly, avoid using hand dryers provide, as the direct heat could comprise the integrity of the case.