I use hot water and plastic bristle brush.
Dry it and leave a light coat of oil on it.
Same. 97% of the time this gets all the residue out. If it doesn’t, I’ll bring some water to a simmer and it then brushes off.
Heat to dry. Dab of oil smeared around with a paper towel. I heat until I see a whisp of smoke. Right or wrong, it’s what I always do.