You can try using an eraser. But the rubber is not effective at the beginning. This method is quite tiring and requires perseverance. Soak it in water, add some dish soap, and then brush it with an old toothbrush. You can also wipe it with a cloth dipped in alcohol or Erguotou. I think many cups and pots now use a relatively high-quality method to print their logo on the cups and pots. Feijian Cup and Pot is one of them.