Burnt pots
I recently set my full pressure cooker on the hob to cook and then promptly forgot about it. About 20 minutes later I removed the lid to find the 5mm-deep, unrecognisable cremated remains of a leek and potato soup. This is how it was cleaned...
Boil lemon juice and baking powder/bicarbonate of soda in the pot, let it boil hard for as long as necessary to lift your burnt meal. If you have conducted a proper cremation, like in m pot, your solution might need refreshing. A little rubbing and scrubbing may help, but the solution will lift 99% of the mess.
I have since reacquainted myself with my oven timer.