Why does hot water usually clean grease better than cold water when washing dishes?

The key isn't that 'hot water dissolves grease,' but that temperature affects the viscosity of oils. When the temperature rises, oils generally become thinner and more fluid, making them easier to disperse and wash away by the surfactants in dish soap. However, the main force 'dealing with the grease' is actually the dish soap's surfactants; hot water just makes the cleaning process easier. So, when washing greasy dishes, moderately warm water + dish soap is often more effective than just using a lot of cold water. 🔬🫧