UPDATE: the commenters' verdict is unanimous: this is not a good idea, because it will damage the iron tip of the soldering iron. Thanks everyone!
These sort of sponges are sold for cleaning the tip of soldering irons:
Now, maybe it's an odd question -- but is there any reason not to use one of these kitchen scrubby things instead?
They are way easier to get, plus they are cheaper.
I'm wondering mainly:
- can you think of a reason why it could be dangerous to use the stainless steel one? (like, poisonous fumes or something)
- would it hurt the soldering iron tip?
It's not good for the iron tip. You should use a brass sponge.