If you left the whiteboard with writings too long without wiping it out, the stains will be come permanent and using a whiteboard eraser won't work.
I found 2 tested ways to remove the pesky whiteboard marker stains which have been left for many days. The 2 ways are
- Use existing whiteboard marker and write over the writings and it will be able to be wiped out
- Use alcohol based products to wipe it off. In the past, alcohol was easy to be obtained from our video cassette cleaning solution. Nowadays, the next best thing would be our hand gel.
Method 2 is the more economical solution as you don't have to waste whiteboard marker ink.
