I ordered a Calphalon windsor pan from Ebay. It just came scoured to a shine! Can it be restored?

If the previous owner put it through the dishwasher there may not be much you can do. Here are some clean and care tips from Calphalon’s site http://www.calphalon.com/en-US/use-and-care-calphalon-simply-calphalon-hard-anodized-ceramic-nonstick