If your pan has developed a chalk-like coating after being put in the dishwasher, it's likely that the coating is a result of the dishwasher detergent or a reaction between the detergent and the pan's surface. Here are some steps to help you get rid of the chalk-like coating:
Avoid using the dishwasher: To prevent further damage, avoid using the dishwasher for this pan or any other cookware that isn't explicitly labeled as dishwasher-safe.
Hand wash the pan: Gently hand wash the pan using a non-abrasive sponge or soft cloth with warm soapy water. Use a mild dishwashing detergent that is suitable for the material of the pan (e.g., for non-stick pans, use a non-stick safe detergent).
Vinegar solution: If the chalk-like coating persists, try using a vinegar solution. Mix equal parts of white vinegar and water in a bowl or sink, then soak the pan in the solution for about 30 minutes to an hour. Vinegar can help dissolve the chalky residue.
Baking soda paste: For more stubborn coatings, make a paste by mixing baking soda with a small amount of water. Apply the paste to the affected areas and let it sit for a few minutes. Scrub the pan gently with a soft sponge or cloth. Baking soda is mildly abrasive and can help remove the coating without scratching the pan.
Rinse thoroughly: After cleaning with vinegar or baking soda, thoroughly rinse the pan with water to remove any remaining residue.
Season the pan (for cast iron pans): If the affected pan is made of cast iron, it might have lost its seasoning due to the dishwasher. To re-season the pan, rub a thin layer of vegetable oil or flaxseed oil over the entire surface of the pan (inside and outside). Place the pan upside down on the oven rack and bake it at around 375°F (190°C) for about 1 hour. Let the pan cool down in the oven before taking it out. This process helps create a protective layer on the cast iron.
Dry thoroughly: After cleaning and rinsing, make sure the pan is completely dry before storing it to prevent any potential issues in the future.
Keep in mind that these steps are general guidelines and may not be suitable for all types of pans. If your pan is made of a specific material (e.g., copper, stainless steel, or non-stick), it's essential to follow the manufacturer's care and cleaning instructions to ensure the longevity of the cookware. If you're uncertain or worried about damaging the pan further, it's best to consult the manufacturer or seek advice from a professional cookware expert.