Can anyone suggest a successful way of cleaning a whiteboard? Currently, I use a weak solution of washing up liquid, but this seems to be slowly removing or coating the outer layer of the board, making it more difficult to rub off the ink during the day, when I am using the board constantly! I've tried all the sprays / mousses etc, but they were far worse (and much more expensive!). They made the ink go really streaky whenever I rubbed it off! I don't want to use dangerous chemicals like bleach, obviously, or anything that smells too strong! I would love to be able to rub something off the board without it leaving a huge stain which partly obscures anything I write on top! Any good ideas? Often the simplest ones work best! Many thanks!!