Straying a bit from the topic, but those 'magic eraser' home cleaning products work on laminated plastic, like you find on day-planner erasable calendars.

Porcelain whiteboards are nice, I've always managed to get them very clean with just rubbing alcohol.

Is there any concern about chipping or even breaking with the glass whiteboards (if, for example, it somehow falls on the floor, eg during moving)?