Generally, this oily handwriting can be erased with organic solvent. I provide some organic solvents that are relatively easy to get. Please try it from top to bottom according to the degree of harm to human body. 1, alcohol or toilet water (toilet water contains alcohol in a large proportion) 2. Glycerol 3, gasoline and nail polish remover are not recommended to be painted by yourself. After all, this kind of marker is designed and drawn on paper when it is produced, which is definitely harmful to human body. If it is really necessary, wash it off immediately after use, and don't leave it for a few days. ...