First scrap out all the grease and residue you can with a spatula.
Then grab our COURSE sea salt. (Only a few dollars for a large size at your cloc grocery store.)
Sprinkle it liberally onto your pan.
Use a sponge or plastic scrubber and firmly push the salt around the pan. Add a tiny bit of water if needed.
You will notice an the salt starts to turn to a dirty color.
When it looks like most of the dirt is in the salt and off the pan, rinse thoroughly.
If you see any remaining residue add more salt and scrub again.
Dry thoroughly and you are ready for your next use.
Some people like to coat the pan with a bit of olive oil to prevent rust but I find that the pan doesn't need that because use it often enough.
Do you have a cleaning tip that you love? Please share :-)