Hi - I'm not sure if this is the right place to ask this question, however:Did anyone register for stainless steel pots and pans? I used one of my pans for the first time and the inside nonw is discolored and has a rainbow hue to it. I followed the cleaning instructions - used a dobie pad, regular dish soap, etc. but it still has discoloration. Can anyone tell me how to make it look new again?TIA!