As a gift last Christmas, I got an All-Clad set but have not been able to use it until now due to new home construction. Now that we have moved in we are able to use our kitchen tools. So far, I have used both the small and large stainless steel skillets and both have stained a dirty yellow-orange greasy color...the very first time I used them and not on a high heat setting on my gas stove. No amount of scrubbing, even with a brillo pad (which I thought you were never supposed to do) is getting it off. I am quite upset and wonder if its defective product.