Marker pens
I found the best way to get permanent marker pen off a chart is to go over the lines etc with a "White Board" marker pen and then wipe both off with a wipe or tissue. No need for any fluids. The white board marker is non- permanent and takes the permanent marker line with it. I carry one in my flight bag. Stragely enough the trick also works on a white board when someone has used a permanent marker pen!