The dry erase laminate we use is designed to be high quality and allow you to write clearly, and wipe away clean—even after the marker has been left for days. Dry erase markers may stain if left on the dry erase surface for over extended periods or when exposed for long periods in the sun. In the rare case that a stain is left on your dry erase foamboard sign, we suggest removing the stain with a non-abrasive cloth and a small amount of isopropyl alcohol or a small amount of hand sanitizer to wipe away tough stains. Citrus based cleaners also work well.