Pans were used (without oils or sprays) to heat corn tortillas. It left black burned marks everywhere the food had touched. After spending hours & many dif ways to clean the pan it still has black spots. I used the larger pan thinking I had to have done something wrong....NOPE! I followed instructions exactly & used it to make pancakes & again black burned marks everywhere!! I did not do anything more than wash it out with soap so you could see the pictures. I hate that I wasted money on these!!