Never leave it dirty with a mess that has water in it. Never wash it with soap. Avoid steel wool unless absolutely necessary. I suggest getting an abrasive sponge like a Scrub Daddy.

To build up or restore a natural non-stick patina: Rub with an oil that has a low smoke point, like olive oil. Then rub off the excess. Place in the oven middle rack, upside down at 450 for one hour. Then turn off the heat and let the pan cool inside the oven. Repeat as many times as needed.

When not in use it should be lightly oiled to protect from oxidation.