Cool the skillet completely
Rinse with hot water
Scrub with a stiff brush or non-scratch sponge
If food is stuck, sprinkle coarse salt and scrub
Avoid soap; if soap is used, rinse thoroughly
Dry immediately with a towel
Place on the stove over low heat for 1–2 minutes to fully evaporate moisture
Apply a thin layer of cooking oil (or flaxseed oil) to the entire surface
Wipe off excess oil
If needed, re-season by heating upside down in a 450°F / 232°C oven for 1 hour, then cool in the oven
Store in a dry place; keep lightly oiled if not used soon