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?