To clean a burnt clad pan, mix equal parts of baking soda and water. Apply the paste to the burnt areas and let it sit for 15 minutes. Scrub the pan using a non-abrasive scrub brush or sponge, focusing on the burnt spots. Rinse the pan thoroughly with hot water, ensuring all traces of baking soda are removed. For stubborn stains, sprinkle salt on the pan and scrub again. Alternatively, fill the pan with water and add 1 cup of vinegar. Boil the mixture for 10 minutes, then remove from heat and allow it to cool. Scrub away any remaining burnt residue. Remember to always use gentle materials and avoid harsh chemicals or abrasive scrubbers to preserve the non-stick surface of your pan.