The bane of my existence is this scorched, burnt, impossible to remove layer of brown cement from the bottom of this pot here. And that isn't even the worst I've ever seen!
– warm water – baking soda – liquid dish soap
Add water, baking soda, and dish soap to the pressure cooker pot. Slosh the mixture around to combine the ingredients.
Secure the lid and turn pressure release knob to a sealed position. Cook at high pressure for 3 minutes.
When cooking time is complete, use a natural release.
The charred residue will now be floating in the soapy liquid. Discard pots contents, give it a quick scrub with a brush if needed, and viola! Pot is like new!