1. Silicone ice tray mold release easier, metal, plastic slightly worse
2. Do not put too much liquid before freezing, so after freezing, twisting the ice tray is very easy to make the ice off
3. Rinse the cold mold with cold water for a few seconds, or soak the bottom of the ice tray in water for a while
4. The frozen ice cubes are just taken out of the refrigerator and do not rush to release them. It is easier to remove the ice cubes at room temperature for a while.