1Fill your sink or a basin with white vinegar and completely immerse the cookie sheet in the vinegar.
Allow the cookie sheet to soak for one to two hours.
2Lift the cookie sheet out of the vinegar, but do not dry it off. Instead, sprinkle baking soda over the sheet.
Scrub the sheet gently with a very soft scrubbing sponge made for non stick pans, or a nylon sock. The baking soda and vinegar will create a gentle scouring paste. This should remove any left over residue.
3Rinse the cookie sheet thoroughly and dry it with a cloth or dish towel
Dry your nonstick bakeware after washing and place cardboard or a thin towel between pans to avoid scratching the coating.
The coating on nonstick bakeware and cookware can be scratched in the dishwasher. Wash your nonstick items by hand.