2. After the old container is filled with water, gently wipe it with a dip pen and repeat it two or three times. Or under natural running water, such as under the faucet of the sink, gently unfold the pen tip and twist the pen tube until it is clean. But it should be noted that the current should not be too fast and the pen should not be forced.

3. When there is basically no ink flowing out, it can be considered as clean. After gently throwing more water along the direction of the pen tip, gently squeeze out the water from the root of the pen tip to the direction of the pen tip with your thumb and forefinger, and straighten the bristles at the same time.

4, hanging, or flat. Not suitable for inversion.