1. Use enamel restorer: Enamel restorer is a product specially used to repair porcelain, which can be used to cover or erase commemorative words. Choose a restorer that matches the color of porcelain and use it according to the product instructions.

2. Wipe with alcohol or vinegar: Wet with cotton ball or soft cloth, dip in appropriate amount of alcohol or vinegar, and gently wipe the commemorative words. The method needs to be tried repeatedly, and the force should be moderate to avoid damaging the porcelain surface.

3. Consult a professional restorer: porcelain restoration has no experience or low value, so it is best to consult a professional restorer.