Modern soaps/detergents don’t contain lye, which is what ruins the seasoning. It’s the humid drying of a dishwasher that causes it to rust. Nothing to with the detergent.
As a mild ph adjuster, you would have to soak your cast iron in Dawn (platinum only) for hours, which would ruin your seasoning no matter the detergent used.
Modern soaps/detergents don’t contain lye, which is what ruins the seasoning. It’s the humid drying of a dishwasher that causes it to rust. Nothing to with the detergent.
Dawn has lye, that’s why it works so well
As a mild ph adjuster, you would have to soak your cast iron in Dawn (platinum only) for hours, which would ruin your seasoning no matter the detergent used.