Does this ever happen to you? You make a sauce or custard with a milk base and it burns onto your pot? My aunt gave me a great tip years ago for cleaning a burnt pot with very little effort.
Put a little water in the pot with some dish detergent or if it is a really bad burn then use some laundry soap. The amount varies with the size of your pot, but dish soap a good squirt and laundry soap a couple of tablespoons. Bring the water to boil. Stir it with a flat bottom spatula, medal or wood.
See how much has come off with just a stir. The last picture is the pot just rinsed, not even scrubbed. Voila, easy peasy. Shiny pot.