I have always been taught to wipe a frying pan out and NEVER to use washing up liquid on it. This is an article of faith for me. now the trouble is I don't have a reason for it. Mrs Chef is more than happy with; 'Don't use soaps on cast iron because it will soak in, but the proper argument of; 'Because I say so and it is what I was told is running out of legs.' If anyone can give agood reason I would be grateful. This is not a wah, but I will take some flak with my name, cheers.