There’s a good chance the dry detergent for a dishwasher can still strip the seasoning off cast iron. Especially generic brands. They’re supposed to have buffers in them to prevent it, but every additive, and mixing time, adds cost.
Your typical hand dish soap is probably safe as long as you’re not scrubbing with steel wool.
IIRC, powdered dish washing detergent is mildly abrasive, and it gets jetted around at relatively high speeds (compared to hand washing). That’s also why it’s bad for knives.
There’s a good chance the dry detergent for a dishwasher can still strip the seasoning off cast iron. Especially generic brands. They’re supposed to have buffers in them to prevent it, but every additive, and mixing time, adds cost.
Your typical hand dish soap is probably safe as long as you’re not scrubbing with steel wool.
IIRC, powdered dish washing detergent is mildly abrasive, and it gets jetted around at relatively high speeds (compared to hand washing). That’s also why it’s bad for knives.