I've only bought the pan a week ago and used it three times. Hot dogs, eggs, and steak.
When I'm done I clean it with a scrubby sponge and once with a little bit of detergent, then put it on the stove to dry quickly. Then while it's hot I smear maybe a teaspoon of vegetable oil on it with a paper towel "brush".
In between uses it's wet with oil, as you can see in the picture. How much residual oil should there be? I had the impression that it would be dryer.
Also, how much should I scrub? I am not going to leave crust of beef on there, but I also don't think it's supposed to be scrubbed back to new smoothness.
When I cook something that leaves gunk that sticks to the pan I usually put it under the tap when hot and rinse it, stirring with a dish brush while the water is boiling. Cleana everything. Heard someone warninf against thermal shock and cracks to the pan. Nothing yet for 20 years.
This is good, I like this plan.