My hard-anodized aluminum pan has been in the dishwasher once or twice and now the outside doesn't look as nice as it once did. How can I restore the exterior back to
![Calphalon 8-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Handles, Dishwasher and Metal Utensil Safe, Black: Frying Pans: Amazon.com.au Calphalon 8-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Handles, Dishwasher and Metal Utensil Safe, Black: Frying Pans: Amazon.com.au](https://m.media-amazon.com/images/I/71G12VBbjrL._AC_UF894,1000_QL80_.jpg)
Calphalon 8-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Handles, Dishwasher and Metal Utensil Safe, Black: Frying Pans: Amazon.com.au
![Calphalon 11-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Handles, Dishwasher and Metal Utensil Safe, Black: Frying Pans: Amazon.com.au Calphalon 11-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Handles, Dishwasher and Metal Utensil Safe, Black: Frying Pans: Amazon.com.au](https://m.media-amazon.com/images/I/71WztinhwoL._AC_UF894,1000_QL80_.jpg)
Calphalon 11-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Handles, Dishwasher and Metal Utensil Safe, Black: Frying Pans: Amazon.com.au
![Calphalon Contemporary Hard-Anodized Aluminum Nonstick Cookware, Saute Pan, 3-Quart, Black | Walmart Canada Calphalon Contemporary Hard-Anodized Aluminum Nonstick Cookware, Saute Pan, 3-Quart, Black | Walmart Canada](https://i5.walmartimages.com/asr/296d2c7a-d7c7-40b5-9a3d-0dd745bc996c_1.9204215e53363e17d3fb1f0aa5a95fbe.jpeg?odnHeight=450&odnWidth=450&odnBg=ffffff)
Calphalon Contemporary Hard-Anodized Aluminum Nonstick Cookware, Saute Pan, 3-Quart, Black | Walmart Canada
![Amazon.com: Calphalon 10-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Stainless Steel Handles, Dishwasher and Metal Utensil Safe, PFOA-Free, Black : Clothing, Shoes & Jewelry Amazon.com: Calphalon 10-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Stainless Steel Handles, Dishwasher and Metal Utensil Safe, PFOA-Free, Black : Clothing, Shoes & Jewelry](https://m.media-amazon.com/images/I/713sH3VGD0L.jpg)
Amazon.com: Calphalon 10-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Stainless Steel Handles, Dishwasher and Metal Utensil Safe, PFOA-Free, Black : Clothing, Shoes & Jewelry
![maintenance - What's happening to the coating on the OUTSIDE of my roommate's non-stick cookware as we wash it? - Seasoned Advice maintenance - What's happening to the coating on the OUTSIDE of my roommate's non-stick cookware as we wash it? - Seasoned Advice](https://i.stack.imgur.com/GW2ou.jpg)
maintenance - What's happening to the coating on the OUTSIDE of my roommate's non-stick cookware as we wash it? - Seasoned Advice
![Black residue on eggs and after washing The Rock pans. Have owned for less than a year. Is this the coating? I have never put in dishwasher or used metal utensils. Wash Black residue on eggs and after washing The Rock pans. Have owned for less than a year. Is this the coating? I have never put in dishwasher or used metal utensils. Wash](https://preview.redd.it/mubh70bqdes91.jpg?auto=webp&s=d61e8573deedfd7880b5375e8f7deef7fb24f4df)
Black residue on eggs and after washing The Rock pans. Have owned for less than a year. Is this the coating? I have never put in dishwasher or used metal utensils. Wash
![maintenance - What's happening to the coating on the OUTSIDE of my roommate's non-stick cookware as we wash it? - Seasoned Advice maintenance - What's happening to the coating on the OUTSIDE of my roommate's non-stick cookware as we wash it? - Seasoned Advice](https://i.stack.imgur.com/jrSTy.jpg)
maintenance - What's happening to the coating on the OUTSIDE of my roommate's non-stick cookware as we wash it? - Seasoned Advice
![Calphalon 11-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Handles, Dishwasher and Metal Utensil Safe, Black: Frying Pans: Amazon.com.au Calphalon 11-Piece Pots and Pans Set, Nonstick Kitchen Cookware with Stay-Cool Handles, Dishwasher and Metal Utensil Safe, Black: Frying Pans: Amazon.com.au](https://images-fe.ssl-images-amazon.com/images/I/71WztinhwoL._AC_UL200_SR200,200_.jpg)