If you don't have whiteboard markers, there are many other ways to remove them. You can use alcohol (if available), or nail polish remover. Nail polish remover is actually very effective at removing all kinds of markers, and more than 90% of them can be used. The reason why it was wiped off is because the nail polish remover contains acetone, and the solubility of acetone is relatively strong.
But if it is written on clothes, it will be a little more troublesome. You can use 84 disinfectant for white clothes. Colored or dark colors will not work. You can also use nail polish remover to wipe a small amount on clothes. If there is a lot, you can buy a small bottle of industrial alcohol online. It can also be removed by washing.