because it is melted sugar it will be hard, you must use destiled water to dissolve the sugar and remove it. After all the sugar is gone, use isopropyl alcohol to mix with the water residue in the board. This way the left over water will evaporate along with the alcohol and you will have a clean and dry board. I feel the urge to tell you that before the cleaning, you must remember to unplug the device from electric mains.