Burnt Pot Recipe
Baking Soda (Bicarbonate of Soda)
Sprinkle baking soda on to base of pot a thin even scattering, pour white vinegar over to cover and leave for a couple of hours. Check the pot after this to see if baking soda and vinegar combo has eaten away the burnt bottom. Warning don't leave the pot for days you might not have a pot bottom left!, basically the soda and vinegar acts like acid.