Full Dry Tip Cleaner product.
A sponge replacement, these soft, metal coils are coated with flux and clean soldering iron tips without thermally shocking them like a wet sponge does. This helps to prolong tip life. Also, in our opinion this cleans more effectively than a sponge.
To clean, thrust the iron into the coils a few times. Don’t scrape the tip on the coils because this can fling molten solder.