Like most teachers I laminate most of my resources so I can use them again and again. There are some resources that I use for maths that are used day in and day out for tables practice, with whiteboard pens. After half a term of doing this, it's becoming harder to get the pen off and stop the answers showing. Does anyone have any suggestions of how to clean the pen off of these or is this a case of making new resources every 6 weeks? Thank you.