As with all stainless steel pans, discoloring can take place when using too high a heat among other things . Our polished stainless steel exterior may be polished with any commercial-grade stainless steel cleaners that are available nationwide at grocery stores and any cookware specialty retailer. You can also use the same fine powder as recommended above, rubbing in a circular motion around the exterior of the pan. Rinse in warm to hot, soapy water & dry immediately.