=Cream of tartar

=Hand soap

=An old credit card or rewards card

Here’s how

Add equal parts baking soda and cream of tartar to the jar (say, two tablespoons of each). Also add a few drops of hand soap and mix it all together. Then add a little warm water and mix until the mixture resembles a thick paste. The burnt parts of the jar should be completely covered! Let them sit and soak for a few minutes, then use the old credit card to scrub away the burn stains. Rinse the jar under water and it will be good as new!