Simple boiling water (100°C) acts thermally: it melts and loosens solidified FOGs and dissolves soap-based scum. It is most effective as preventive maintenance or after partial blockage. However, boiling water cannot remove solid debris (hair, fibrous food) and should not be used on PVC joints weakened by prior chemical exposure.
Dealing with a slow-draining sink is frustrating, but you don't need toxic chemical cleaners to fix it. Standard store-bought unblockers often contain sulfuric acid or sodium hydroxide, which can corrode your pipes over time and harm the environment. natural sink unblocker
You likely have most of these items in your pantry: Simple boiling water (100°C) acts thermally: it melts