My youngest has a couple of board books with mazes in them. A dry erase marker is supposed to be used when drawing in the book so it can be erased and used over and over.
One evening I was in the shower. My husband and my youngest decided to read some books together, and my son grabbed his mazes as well. He also grabbed himself a marker and they got to work. It wasn’t until later they realized it was actually a permanent marker.
They tried wiping it off with an eraser, using a wipe, Windex, etc. Nothing worked. Luckily, I know a trick! I swear I’ve done this a hundred times!