@rotuts I tried your proposed test, and did not notice any residue. Maybe it accumulates so slowly that it will take a few days for me to be able to actually observe anything. The bottom of the pan felt a little moist, for what that's worth.
Here are pics of the flame on the heavy-use eyes.
And, I see here that the bottom of my moka pot is all carbonized, too. Hmm. I've had this thing for 2.5 years. Unlike the skillets, though -- this thing is never washed or anything like that. It gets, you know, wiped down occasionally. But no soap touches the mokapot, ever. Maybe there is just too much grease in my house, everywhere. It is possible!
