I have a set of calphalon tri-ply copper cookware and find it impossible to obtain the bright, shiny finish they had prior to the first use. I clean them with the calphalon cream polish, then quickly dry them to avoid spotting, however, the next day I notice darker swirl marks and other discolorations. I hang them on a pot rack rather than storing in a cabinet; would being exposed to the air make a difference? I would appreciate any tips/advice. p.s. I've also tried brasso and find the same disappointing results.