No one likes to scrub a sticky pan. Heaven forbid you should burn your food to the pan — you may end up with seven rounds and three days of scrubbing.
Before you pour too much elbow grease into your burned-on nasty pan, fill it with water, add a tablespoon or two of baking soda, bring the water to a boil, and let it boil for about ten minutes. You will be amazed at how much easier your scrubbing task will be.
In the picture here, I had burned some sugary-concoction beyond recognition. It was caked to the bottom of the pan. The picture is after one round of boiling and scrubbing. After that round, I did the boiling bit again and it was nothing to get those remaining tough spots cleaned up.