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Sad_Application_5361 posted on r/professors1d
Any chance you grabbed a vis a vis marker instead of a dry erase marker? I’ve heard of it happening before. A lot of offices buy the low odor version of the markers. The originals may work better for you. https://www.amazon.com/Expo-Original-Markers-Chisel-Assorted/dp/B00006IFIT. It also could be that the finish on the whiteboard has gotten too degraded to wipe off easily. They make whiteboard cleaning spray and wipes that works better than water. The eraser itself could also have a lot of marker gunk on it. You can generally wash the pad with soap and water.