Has THIS ever happen to you?
Sure! all the time a hotdog is left to boil and an hour later amidst the dense chocking white smoke in the kitchen is a pot full of hard layered crud that is practically impossible to remove. Generally the only way to remove the black crud is to chisel it out with a butter knife, or simply toss the pot out with the trash. But what if your pot is part of a costly set? Well there is a way. All you need is hydrogen peroxide. The 3% antiseptic in the brown bottle is fine, but if you have the hair bleacher strength, that'll work well too. Simply pour an amount to coat the bottom of the pot and place it on the range top and heat but don't let boil. Turn off the heat and let stand until cool, generally it'll then be ready to pour away and clean. If your burnt crud is well-burnt-in as in this pressure cooker, you may have to let stand for a couple hours. remember not to let boil, but only gently heat. Many times the burnt crud will come out as a hard disc.
SOAKING CRUD FLAKE VOILA!
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Note: if you search the internet on cleaning burnt pots, you'll find baking soda which cannot work. Furthermore baking soda when heated turns into sodium hydroxide... lye, and lye will destroy teflon coatings and dissolve aluminum surfaces, and micro-abrasive stainless surface making it more likely to stick food!
~WARNING Science Content Below~
This burnt crud consist of mostly carbon but what makes this stuff hard is it is a plastic. Meat is high in fatty acids and amino acids, These when heated above 300F the volatile components have all evaporated thus the heavier moleculars plasticize into long chain molecules. At above 450F these long chain molecules mostly carbohydrates looses water and start becoming black (carbon) The strong smell is caused by other esters and components from the juices of foods being cooked. At which time you cut the heat on the pot, this plastic has statically bonded with the metal in the pot. If the pot is aluminum certain fattyacids and alkali metal carbonates form oxides at high temperatures and will actually eat at the aluminum surface, thus making crud bondage to this extra strong. If your pot is Teflon lined, then the crud's alkali metal oxides have weaken the Teflon bond to the metal surface and may release parts of that Teflon. Glass pots may prove difficult, but it does work but with more elapsed time. The use of hydrogen peroxide is thought to loosen the bond of the crud layer. Hydrogen peroxide when in contact to metals will release oxygen, and this oxygen attaches to the crud layer and releasing its grip of the metal.