1. Pour a proper amount of warm water into a small bowl for later use, as shown in the figure below.
2. Next, take out the cans and pour them in warm water, as shown in the figure below.
3. Take out the cans after a few minutes and dry the water on the cans with a rag, as shown in the figure below.
4. Next, unscrew the tank cover counterclockwise, as shown in the figure below.
Finally, you can easily open the lid of the can, as shown in the figure.