just don't scrub hard with them, they absolutely will remove/scratch up your seasoning. had to re-season a pan recently because my roomie doesn't understand you need to preheat cast iron to pretty hot before you cook a bunch of cheese and egg omelets in it. He felt guilty and went to town with the chain mail scrubber when you just need to gently scrub with it.
Yep! A small amount of thick kosher salt and a paper towel is all I ever need if something sticks to a cast iron or carbon steel pan. Do it while it's still hot and it's easier. And if it's stainless steel, I boil some water with a drop of dish soap and baking soda. Whatever is stuck lifts off by itself.