NanoBond's molecular titanium cooking surface is extra durable and exceptionally easy to clean. To maintain your NanoBond's original brilliance, we recommend occasionally using a soft cleanser like Hestan Professional Grade Cleaner. Hestan Cleaner easily removes any bluing, which results from cooking oils becoming trapped on the nano layers. This is actually a sign they are doing their job and protecting the pan's core. Hestan Cleaner is specially-formulated to restore your NanoBond's titanium luster. Made in the USA.