What Is This Greasy Black Stuff That Appears On My Frying Pan After It Has Been Through The Dishwasher?

Sounds like the residue left over after Chlorine is used to remove Sulfur from water on a large scale?
Go to the water container behind your toilet and lift the lid! Is there a stain that's real dark in color or a film on the top of the water?
If yes, then email me sweetness!

Then if it's a Cast Iron Email me, TOO!