victoria (cast iron maker that’s a above lodge but below others,) recommends using a little dish soap.

even if the soaps do remove some seasoning, you should have enough on there, and cooking with enough oil that it regenerates. That’s the secret to cast iron’s longevity, in point of fact. Every time you cook with it, you add some more to the seasoning. (it also can develop some marvelous flavors if you’re intentional in how you cook with it.)