I ordered the sponge due to the many good reviews. After weeks of waiting time that was previously bakannt however, the sponge arrived today at last.
Unfortunately, the sponge does not work at! I have tried both sides with different amounts of pressure, but the whiteboard is not clean wipe. Just to see if there is perhaps at my whiteboard, I have tried with my finger to remove the written - and that worked perfectly.
Conclusion: cheap scrap is scrap in diesesm case cheaply, which can be used only to throw it away. Furthermore, the sponges smell incredible.
Buy some better for a few euros an ordinary sponge!