2. Then rinse with clear water to make the upper wet, as shown in the figure below.
3. Then mix baking soda and white vinegar into a mixed solution, and keep stirring to make the mixed solution bubble, as shown in the figure below.
4. Next, brush the traces of the ballpoint pen on the vamp with a toothbrush dipped in the mixed solution, so that the traces of the ballpoint pen can be fully decomposed, as shown below.
5. After brushing, put the shoes in the washing machine and wash them again, as shown in the figure below.
6. After the shoes are finally dried, the ballpoint pen marks on the shoes disappear, as shown in the figure below.