1 First, you can soak it in thick tea dirt or plant ash for dozens of hours and wipe it with thick paper.

2. Secondly, if it is an overglaze decal, the word can be wiped off with a wet soft cloth and very fine dust for a long time.

3. Finally, apply a layer of hydrofluoric acid solution with low concentration on the handwriting, and look at it later, but be careful not to corrode the glaze too much.