This wet Soldering Iron TIP Cleaner  Soldering Sponge is used to clean the corrosion on the tip of the iron. A dry Soldering Sponge does nothing but damage the tip. Every time you pull the iron from the stand, it’s a good idea to swipe the tip on the sponge just to clean it off and get a nice silver tip it will allow you to solder much more quickly and cleanly.