I taught our writing co-op (14 students, grades 4-9) again this week. It was a lively class; we brainstormed/outlined two paragraphs. Then I erased the outlines so we could write a paragraph. I had filled almost the entire board before realizing that somehow I was now writing with a permanent marker. Aargh!
I hunted the internet for solutions. The best bet so far seems to be "Spot Shot" carpet cleaner (which we happen to have) rubbed off with a Mr. Clean Magic Eraser. Len added some elbow grease, and the board has progressed to the hazy stage. I'll try another treatment in attempt to achieve complete cleanliness.
Not exactly the kind of teaching moment I'd been hoping for... ;-)