Cork board is often glued to a wall to hold it in place. While using an adhesive will secure cork board to a wall, it is better to glue the cork board to a backing, then fasten the assembly to the wall. This prevents the wall from possibly being ruined when the cork is taken down. However, if you are taking down cork board that has been glued directly to the wall, you'll have to use a lot of elbow grease to get the cork board adhesive off the surface.
Open the windows to increase air circulation and ventilate the space.
Put on rubber gloves and a dust mask to protect your eyes and lungs from the adhesive itself and the fumes it emits.
Begin to scrape away as much of the remaining cork board, along with the glue, using a razor or paint scraper. Hold the paint scraper or razor at a shallow angle, about 20 to 25 degrees, to avoid gouging the wall. Scrape in small sections, gently working the cork board and glue away from the wall.
Dip a scrub sponge in water-based adhesive remover. Thoroughly rub over the cork board glue to break it up. This may require several passes over a single area to effectively remove the adhesive from the wall.
Dampen a clean sponge with plain water and use it to rinse off the wall, once the cork board glue has been completely removed from the surface.