Either screen will fully erase even the residual markings as long as our specialized whiteboard eraser is used. Both versions of the whiteboard screen are surfaced in a scratch-resistant optical nanotech resin that enables them to perform their dual-role. This surface allows either screen to be matte enough for a projected image without hot-spotting, but smooth enough to erase pen strokes. Because of the unique texture in its design, a regular store-bought whiteboard eraser will work but it may not completely clear away the residual markings. However, the grey surface of the Starbright™ 4 material does made difference to readily identify any residual markings over the bright white surface of the “white” WhiteboardScreen™ Universal.