If the pan was not seasoned properly or a portion of the seasoning wore off and food sticks to the surface or there is rust, then it should be properly cleaned and re-seasoned.

1. Remove any food residue by cleaning the pan thoroughly with hot water and a scouring pad. I understand that heating the pan first to a temperature that is still safe to touch helps open the pores of the metal and makes it easier to clean.
2. Dry the pan immediately with dish towel or paper towel.
3. Season the pan as outlined above.