Just a bit more info….
Dry erase markers work ok on the activity center. It varies a bit on the brand… Dry erase board crayons do NOT work on it. And that is all we tried.
For our practice sheets, I have switched to a basic sheet protector, and I’m using Staedtler non-permanant markers. [medium tip] (not dry-erase.) Then I don’t need to worry about hands smearing etc.. When all done, I can clean it with a damp paper-towel etc. I am also using it for a reading program where I mark off what has been read correctly. I can leave it on for days (needed) – until done a section – and then easily remove it to use the pages for the next child.
btw – my dh said that when he was in the military, they used the Staedtler PERMANENT markers on their maps (covered with map-tak). The marks were on the map, wouldn’t come off, even if it got wet. When done, they would clean it off with nail-polish remover, and the maps were ready to be used again. But that seemed over-kill for my needs… lol.