Black residue on new stainless steel cookware
I just bought a Kirkland Signature 13-piece stainless steel cookware set. I thoroughly cleaned the pieces twice with lots of Dawn dishwashing liquid and dried them. However, afterwards I wiped one of the inside surfaces with a clean paper towel and the paper was stained black with some kind of residue. Does anyone know if this is a defect and I should return the set or if this normal for brand new SS cookware and I just need to clean it with stronger stuff?