Step 1: First, pour white vinegar on the rag to wipe the wall. As shown in the figure

Step 2: Then apply toothpaste to the rubber particles on the wall. As shown in the figure

Step 3: Then continue to wipe the wall with a rag. As shown in the figure

Step 4: Then pour the alcohol on the rag and clean the wall. As shown in the figure

Step 5: Finally, clean up the rubber particles on the wall, as shown in the figure.