The physics are against it. Hot water cools within a metre or two of pipework, so any grease it melts is redeposited downstream, often somewhere much harder to reach. Over months this migrates the blockage rather than removing it.
Hot (not boiling) water with washing-up liquid, run for a couple of minutes weekly, is a reasonable maintenance habit for a kitchen sink. It is prevention, not cure.
Once flow has actually stopped, the deposit is compacted and only mechanical clearing — a snake, rods, or high-pressure jetting — will remove it.