B.W.
I started laughing when I read this because we just did this a couple of months ago. Get the Mr. Clean Magic Eraser. I had never used it before, but my 2 year old daughter took a permanent Sharpie marker and decided to "write" (i.e. scribble over and over) on the printer, the computer keyboard, and my husband's work's projector that we had been borrowing that costs thousands and thousands on dollars. The Magic Eraser took it right off, and we were so relieved! Good luck.