
Using Glass cleaner, or household cleaner on a Dry-Erase board is a very bad idea. Ammonia in glass cleaner, and bleach in household cleaners will decrease the lifespan of the dry-erase caoting on the board!!! You are better off using NON-Acetone fingernail polish remover, than anything else for tuff stains.
Cleaning should be done in this order: Dry Erase Eraser, Dry soft cloth, Wet(Water) Cloth, Mild Soapy Water, Dry Erase Cleaner, then NON-Acetone Polish remover.
Hope that helps.