For moderate stains, mix together vinegar and baking soda to form a paste and spread it liberally on top of the jelly roll pan. Leave the paste there for at least 30 minutes, and viola! Your pan should be totally clean. If the pan has baked-in grease or more serious stains the vinegar and baking soda method won’t get rid of, substitute hydrogen peroxide for the vinegar. After spreading the paste, leave for three hours. This heavier-duty method should leave your pan looking like new!