The specific steps are as follows:

1, add a proper amount of alcohol to the handwritten part of the school uniform.

2. Then use a toothbrush or clothes brush to brush the part with handwriting on the clothes.

3. Dip a bar of soap in a little water and apply it to the part with handwriting on the clothes.

4. Continue to use the toothbrush.

It can be seen that the handwriting has been removed a lot, and there is basically no trace.