You can buy a cleaner that is made specifically for white boards, but it's usually really expensive and I go through it so quickly that I end up needing a new bottle often. So after a bit of trial and error, I discovered that a little rubbing alcohol cleans them up perfectly. The higher the percentage the better, I used 90% and my white boards look brand new. Plus rubbing alcohol is way cheaper than the products made just for white boards. Give it a try, it works wonders, even on tired, old, whiteboards.
If you are still in school and you've got a Filed Day coming up, I've got a Freebie for you that ties in perfectly. Just click the pic for the download.
I'll keep you updated on my countdown survival.