What cori said. If you need to loosen the grease, just heat the pan gently to warm, and then wipe it.
And I'd emphasize that about half a dozen seasoning sessions are optimal: use a very small amount of fat or oil, wipe it out (without washing), and repeat. Some places even recommend seasoning the pan upside down with a tray underneath to catch excess, but I never bothered and my cast iron is practically non-stick now. It stands up to light amounts of detergent if needed without losing its seasoning.
A way a lone a last a loved a long the ... riverrun, past Eve and Adam's ...