How to clean the marble surface!
Can also use the heating way to make double-sided adhesive glue softening: with a hair dryer blowing it to viscose softening, when double-sided adhesive adhesion is weak, can be removed more easily.
You can take a piece of vinegar soaked cloth to cover the whole area of the double-sided glue traces, until the double-sided adhesive stains completely soaked, you can easily remove the ruler.
Rub along the edge of the eraser with a little bit of eraser, easy to trace. However, depending on the degree of adhesion, it may be different. If the conditional alcohol + eraser effect is very good