The heat is going to react with the metals. You have to be diligent in cleaning the stuff to keep it pretty. Always be careful with the heat (I used to work in a kitchen store, and saw many a dismayed customer bringing back ruined pots and pans because they simply used too much heat.) That being said - another really awesome product is Astonish. That stuff will take stains out of anything stainless steel. You can google it, or order it at the store I used to work for -
www.complementstothechef.com.
Congrats on the yummy new set! May you make many a scrumptious omelette, and may your water never boil over
