Pour some dish detergent in the pan and fill it with hot water. Leave the pan overnight so the solution loosens the stain. In the morning wipe the pan with a sponge and try to remove the burnt sugar. Third recipe is if the first two recipes fail to clean the stain. Put some water in another pan and bring to a boil. Add two or three tablespoons of baking soda and pour the solution in the burned pan. Leave it for a couple of minutes to cool off. After that try to remove the sugar stain with a sponge or a soft bristled brush. These tips should be sufficient for removing the stubborn stain.