This is how I remove stubborn food remnants from my pans (aluminum or stainless steel): 1) sprinkle the area with baking soda; 2) spray or pour vinegar on top, then watch it fizzle (my favorite part); 3) Let sit 5 min., or more for really tough stains); 4) Scrub off w/ a little water + sponge. Repeat if you don’t get it all the first time. Et voila!