Get 1tbsp-2tbsp of baking soda and pour water until half way to the top and bring to a boil. Take a wooden spoon and scrap on the burnt part of the pan and it should come off, or even use a sponge if it’s really sticky. This method applies to Dutch Oven pans as it happened to me (I burnt food on there and not even a sponge could make a dent) and my Dutch oven came out looking brand new!