A dry cloth like teachers used in classrooms no longer does the trick, mainly due to the invention of liquid chalk pens. Nowadays, there are a few ways to get that refreshing black surface looking as good as new.
There's a quick video on the steps to clean a chalkboard on our Youtube page...
http://youtu.be/xcFi8iyx8Tg
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For more information, please do not hesitate to contact CUK on 01384 445844 or e-mail sales@chalkboardsuk.com